Baltimore-Washington Metropolitan Area

The Baltimore-Washington Metropolitan Area is a combined statistical area

Combined Statistical Area

The United States Office of Management and Budget defines micropolitan and metropolitan statistical areas. Metropolitan and micropolitan statistical areas consist of one or more counties...

consisting of the overlapping labor market region of the cities of Baltimore, Maryland and Washington, D.C.

Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

. The region includes Central Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

, Northern Virginia

Northern Virginia

Northern Virginia consists of several counties and independent cities in the Commonwealth of Virginia, in a widespread region generally radiating southerly and westward from Washington, D.C...

, and Jefferson County

Jefferson County, West Virginia

Jefferson County is a county located in the U.S. state of West Virginia. As of 2010, the population was 53,498. Its county seat is Charles Town...

in the Eastern Panhandle

Eastern Panhandle of West Virginia

The Eastern Panhandle of West Virginia is a narrow stretch of territory in the northeast of the state, bordering Maryland and Virginia, United States. The Eastern Panhandle Board of Realtors and other local civic organizations consider only the three Easternmost counties, Jefferson, Berkeley and...

of West Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

. It is the most educated, highest-income, and fourth largest

Table of United States Combined Statistical Areas

thumb|An enlargeable map of the 125 [[Combined Statistical Area]]s of the [[United States]]The United States Office of Management and Budget has defined 125 Combined Statistical Areas for the United States of America...

Combined Statistical Area

The United States Office of Management and Budget defines micropolitan and metropolitan statistical areas. Metropolitan and micropolitan statistical areas consist of one or more counties...

in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.

Officially, the area is designated by the Office of Management and Budget (OMB) as the Washington-Baltimore-Northern Virginia, DC-MD-VA-WV CSA. It is composed primarily of two major metropolitan areas, the Baltimore-Towson, MD MSA and the Washington-Arlington-Alexandria, DC-VA-MD-WV
Washington Metropolitan Area
The Washington Metropolitan Area is the metropolitan area centered on Washington, D.C., the capital of the United States. The area includes all of the federal district and parts of the U.S...

MSA. In addition, three other smaller urban areas not contiguous to the main urban area but having strong commuting ties with the main area are also included in the metropolitan area. These are the Winchester, VA-WV
Winchester, VA-WV MSA
Winchester, VA-WV MSA is a U.S. Metropolitan Statistical Area as defined by the United States Office of Management and Budget as of June, 2003. Its population as of 2008 U.S. Census Bureau estimates is 122,369....

MSA, the Lexington Park, MD Micropolitan area
United States micropolitan area
United States Micropolitan Statistical Areas , as defined by the United States Office of Management and Budget, are urban areas in the United States based around a core city or town with a population of 10,000 to 49,999. The micropolitan area designation was created in 2003...

and the Culpeper, VA Micropolitan area. Some counties and cities are not officially designated by the OMB as members of this metropolitan area, but still consider themselves members anyway. This is mostly due to their proximity to the area, the size of their commuter population, and by the influence of local broadcasting stations. The population of the entire Baltimore-Washington Metroplex as of the 2010 Census is 8,924,087.
The most populous city is Baltimore

Baltimore

Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...

, with a population of 637,455. The most populous county is Fairfax County, Virginia

Fairfax County, Virginia

Fairfax County is a county in Virginia, in the United States. Per the 2010 Census, the population of the county is 1,081,726, making it the most populous jurisdiction in the Commonwealth of Virginia, with 13.5% of Virginia's population...

, with a population exceeding 1 million.

Components of the metropolitan area

The counties and independent cities and their groupings that comprise the metropolitan area are listed below with 2010 Census populations.

Washington Metropolitan Area (5,582,170)
- Bethesda-Frederick-Gaithersburg, MD Metropolitan Division (1,205,162)
  - Frederick County, Maryland
    Frederick County, Maryland
    Frederick County is a county located in the western part of the U.S. state of Maryland, bordering the southern border of Pennsylvania and the northeastern border of Virginia. As of the 2010 Census, the population was 233,385....
  - Montgomery County, Maryland
    Montgomery County, Maryland
    Montgomery County is a county in the U.S. state of Maryland, situated just to the north of Washington, D.C., and southwest of the city of Baltimore. It is one of the most affluent counties in the United States, and has the highest percentage of residents over 25 years of age who hold post-graduate...
- Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Division (4,377,008)
  - Washington, D.C.
    Washington, D.C.
    Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....
  - Calvert County, Maryland
    Calvert County, Maryland
    Calvert County is a county located in the U.S. state of Maryland. It occupies the Calvert Peninsula which is bordered on the east by the Chesapeake Bay and on the west by the Patuxent River. Calvert County is part of the Southern Maryland region. Calvert County's residents are among the highest...
  - Charles County, Maryland
    Charles County, Maryland
    Charles County is a county in the south central portion of the U.S. state of Maryland.As of 2010, the population was 146,551. Its county seat is La Plata. This county was named for Charles Calvert , third Baron Baltimore....
  - Prince George's County, Maryland
    Prince George's County, Maryland
    Prince George's County is a county located in the U.S. state of Maryland, immediately north, east, and south of Washington, DC. As of 2010, it has a population of 863,420 and is the wealthiest African-American majority county in the nation....
  - Arlington County, Virginia
    Arlington County, Virginia
    Arlington County is a county in the Commonwealth of Virginia. The land that became Arlington was originally donated by Virginia to the United States government to form part of the new federal capital district. On February 27, 1801, the United States Congress organized the area as a subdivision of...
  - Clarke County, Virginia
    Clarke County, Virginia
    Clarke County is a county in the Commonwealth of Virginia. As of 2010, the population was 14,034. Its county seat is Berryville.-History:Clarke County was established in 1836 by Thomas Fairfax, 6th Lord Fairfax of Cameron who built a home, Greenway Court, on part of his 5 million acre property,...
  - Fairfax County, Virginia
    Fairfax County, Virginia
    Fairfax County is a county in Virginia, in the United States. Per the 2010 Census, the population of the county is 1,081,726, making it the most populous jurisdiction in the Commonwealth of Virginia, with 13.5% of Virginia's population...
  - Fauquier County, Virginia
    Fauquier County, Virginia
    As of the census of 2000, there were 55,139 people, 19,842 households, and 15,139 families residing in the county. The population density was 85 people per square mile . There were 21,046 housing units at an average density of 32 per square mile...
  - Loudoun County, Virginia
    Loudoun County, Virginia
    Loudoun County is a county located in the Commonwealth of Virginia, and is part of the Washington Metropolitan Area. As of the 2010 U.S. Census, the county is estimated to be home to 312,311 people, an 84 percent increase over the 2000 figure of 169,599. That increase makes the county the fourth...
  - Prince William County, Virginia
    Prince William County, Virginia
    -National protected areas:* Featherstone National Wildlife Refuge* Manassas National Battlefield Park* Occoquan Bay National Wildlife Refuge* Prince William Forest Park-Government and politics:...
  - Spotsylvania County, Virginia
    Spotsylvania County, Virginia
    As of the census of 2000, there were 90,395 people, 31,308 households, and 24,639 families residing in the county. The population density was 226 people per square mile . There were 33,329 housing units at an average density of 83 per square mile...
  - Stafford County, Virginia
    Stafford County, Virginia
    Stafford County is a county located in the Commonwealth of Virginia, a U.S. state, and just across the Rappahannock River from the City of Fredericksburg. As of the 2000 census, the population was 92,446, increasing to 128,961 in 2010.. Its county seat is Stafford. In 2006, and again in 2009,...
  - Warren County, Virginia
    Warren County, Virginia
    As of the census of 2000, there were 31,584 people, 12,087 households, and 8,521 families residing in the county. The population density was 148 people per square mile . There were 13,299 housing units at an average density of 62 per square mile...
  - Alexandria, Virginia
    Alexandria, Virginia
    Alexandria is an independent city in the Commonwealth of Virginia. As of 2009, the city had a total population of 139,966. Located along the Western bank of the Potomac River, Alexandria is approximately six miles south of downtown Washington, D.C.Like the rest of northern Virginia, as well as...
  - Fairfax, Virginia
    Fairfax, Virginia
    The City of Fairfax is an independent city forming an enclave within the confines of Fairfax County, in the Commonwealth of Virginia in the United States. Although politically independent of the surrounding county, the City is nevertheless the county seat....
  - Falls Church, Virginia
    Falls Church, Virginia
    The City of Falls Church is an independent city in Virginia, United States, in the Washington Metropolitan Area. The city population was 12,332 in 2010, up from 10,377 in 2000. Taking its name from The Falls Church, an 18th-century Anglican parish, Falls Church gained township status within...
  - Fredericksburg, Virginia
    Fredericksburg, Virginia
    Fredericksburg is an independent city in the Commonwealth of Virginia located south of Washington, D.C., and north of Richmond. As of the 2010 census, the city had a population of 24,286...
  - Manassas, Virginia
    Manassas, Virginia
    The City of Manassas is an independent city surrounded by Prince William County and the independent city of Manassas Park in the Commonwealth of Virginia in the United States. Its population was 37,821 as of 2010. Manassas also surrounds the county seat for Prince William County but that county...
  - Manassas Park, Virginia
  - Jefferson County, West Virginia
    Jefferson County, West Virginia
    Jefferson County is a county located in the U.S. state of West Virginia. As of 2010, the population was 53,498. Its county seat is Charles Town...

Baltimore-Towson, MD MSA (2,799,226)
- Baltimore City
  Baltimore
  Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...
- Anne Arundel County
  Anne Arundel County, Maryland
  Anne Arundel County is a county located in the U.S. state of Maryland. It is named for Anne Arundell , a member of the ancient family of Arundells in Cornwall, England and the wife of Cæcilius Calvert, 2nd Baron Baltimore. Its county seat is Annapolis, which is also the capital of the state...
- Baltimore County
  Baltimore County, Maryland
  Baltimore County is a county located in the northern part of the US state of Maryland. In 2010, its population was 805,029. It is part of the Baltimore-Washington Metropolitan Area. Its county seat is Towson. The name of the county was derived from the barony of the Proprietor of the Maryland...
- Carroll County
  Carroll County, Maryland
  Carroll County is a county located in the U.S. state of Maryland. In 2010, its population was 167,134. It was named for Charles Carroll of Carrollton , signer of the American Declaration of Independence. Its county seat is Westminster....
- Harford County
  Harford County, Maryland
  Harford County is a county in the U.S. state of Maryland. In 2010, its population was 244,826. Its county seat is Bel Air. Harford County forms part of the Baltimore-Washington Metropolitan Area.-History:...
- Howard County
  Howard County, Maryland
  -2010:Whereas according to the 2010 U.S. Census Bureau:*62.2% White*17.5% Black*0.3% Native American*14.4% Asian*0.0% Native Hawaiian or Pacific Islander*3.6% Two or more races*2.0% Other races*5.8% Hispanic or Latino -2000:...
- Queen Anne's County
  Queen Anne's County, Maryland
  Queen Anne's County is a county located on the Eastern Shore of the U.S. state of Maryland.As of 2010, the population was 47,798. Its county seat and most populous municipality is Centreville. The census-designated place of Stevensville is the county's most populous place...

Hagerstown-Martinsburg, MD-WV MSA (269,140)
- Washington County, Maryland
  Washington County, Maryland
  Washington County is a county located in the western part of the U.S. state of Maryland, bordering southern Pennsylvania to the north, northern Virginia to the south, and the Eastern Panhandle of West Virginia to the south and west. As of the 2010 Census, its population is 147,430...
- Berkeley County, West Virginia
  Berkeley County, West Virginia
  Berkeley County is a county located in the Eastern Panhandle region of the U.S. state of West Virginia. As of 2010, the population is 104,169, making it the second-most populous county in West Virginia, behind Kanawha...
- Morgan County, West Virginia
  Morgan County, West Virginia
  Morgan County is a county located in the U.S. state of West Virginia. As of 2010, it's population was 17,541. Its county seat is Berkeley Springs. The county is one of three in Hagerstown-Martinsburg, MD-WV Metropolitan Statistical Area...

Winchester, VA-WV MSA (124,711)
- Frederick County, Virginia
  Frederick County, Virginia
  Frederick County is a county located in the Commonwealth of Virginia. It is included in the Winchester, Virginia-West Virginia Metropolitan Statistical Area. It was formed in 1743 by the splitting of Orange County. For ten years it was the home of George Washington. As of 2010, the population was...
- Winchester city, Virginia
  Winchester, Virginia
  Winchester is an independent city located in the northwestern portion of the Commonwealth of Virginia in the USA. The city's population was 26,203 according to the 2010 Census...
- Hampshire County, West Virginia
  Hampshire County, West Virginia
  Hampshire County is a county located in the U.S. state of West Virginia. As of 2010, the population was 23,964. Its county seat is Romney, West Virginia's oldest town . Hampshire County was created by the Virginia General Assembly on December 13, 1753, from parts of Frederick and Augusta counties ...

Lexington Park
Lexington Park
Lexington Park was the name of a former minor league baseball park in St. Paul, Minnesota. It was the home of the St. Paul Saints from 1897 through 1956, when it was replaced by the first version of Midway Stadium....

, MD Micropolitan Area (101,151)
- St. Mary's County

Culpeper, VA Micropolitan Area (47,689)
- Culpeper County
  Culpeper County, Virginia
  As of the census of 2000, there were 34,262 people, 12,141 households, and 9,045 families residing in the county. The population density was 90 people per square mile . There were 12,871 housing units at an average density of 34 per square mile...

Metropolitan Washington Council of Governments

Founded in 1957, the Metropolitan Washington Council of Governments

Metropolitan Washington Council of Governments

The Metropolitan Washington Council of Governments is a regional organization of Washington area local governments. MWCOG comprises 21 local governments in the Washington Metropolitan Area, as well as area members of the Maryland and Virginia state legislatures, the U.S. Senate, and the U.S. House...

(MWCOG) is a regional organization of 21 Washington-area local governments, as well as area members of the Maryland

Maryland General Assembly

The Maryland General Assembly is the state legislature of the U.S. state of Maryland. It is a bicameral body. The upper chamber, the Maryland State Senate, has 47 representatives and the lower chamber, the Maryland House of Delegates, has 141 representatives...

and Virginia

Virginia General Assembly

The Virginia General Assembly is the legislative body of the Commonwealth of Virginia, and the oldest legislative body in the Western Hemisphere, established on July 30, 1619. The General Assembly is a bicameral body consisting of a lower house, the Virginia House of Delegates, with 100 members,...

state legislatures, the U.S. Senate, and the U.S. House of Representatives. MWCOG provides a forum for discussion and the development of regional responses to issues regarding the environment, transportation, public safety, homeland security, affordable housing, community planning, and economic development.

The National Capital Region Transportation Planning Board, a component of MWCOG, is the federally-designated Metropolitan Planning Organization

Metropolitan planning organization

A metropolitan planning organization is a federally-mandated and federally-funded transportation policy-making organization in the United States that is made up of representatives from local government and governmental transportation authorities...

for the metropolitan Washington area.

Baltimore Metropolitan Council

The Baltimore Metropolitan Council is the equivalent organization for the Baltimore portion of the combined Baltimore-Washington Metropolitan Area. The BMC, which was created in 1992 as the successor to the Regional Planning Council and Baltimore Regional Council of Governments, consists of the Baltimore region’s elected executives, representing Baltimore City and Anne Arundel, Baltimore, Carroll, Harford and Howard counties.

The Baltimore Regional Transportation Board is the federally recognized Metropolitan Planning Organization for transportation planning in the Baltimore region.

List of principal cities

See List of cities in the Baltimore-Washington Metropolitan Area for a full list.

Baltimore area

Baltimore, Maryland
Aberdeen, Maryland
Aberdeen, Maryland
As of the census of 2000, there were 13,842 people, 5,475 households, and 3,712 families residing in the city. The population density was 2,166.2 people per square mile . There were 5,894 housing units at an average density of 922.4 per square mile...
Annapolis, Maryland
Annapolis, Maryland
Annapolis is the capital of the U.S. state of Maryland, as well as the county seat of Anne Arundel County. It had a population of 38,394 at the 2010 census and is situated on the Chesapeake Bay at the mouth of the Severn River, south of Baltimore and about east of Washington, D.C. Annapolis is...
Columbia, Maryland
Columbia, Maryland
Columbia is a planned community that consists of ten self-contained villages, located in Howard County, Maryland, United States. It began with the idea that a city could enhance its residents' quality of life. Creator and developer James W. Rouse saw the new community in terms of human values, not...
Towson, Maryland
Towson, Maryland
Towson is an unincorporated community and a census-designated place in Baltimore County, Maryland, United States. The population was 55,197 at the 2010 census...
Ellicott City, Maryland
Ellicott City, Maryland
Ellicott City is an unincorporated community and census-designated place in Howard County, Maryland, United States. It is part of the Baltimore-Washington Metropolitan Area. The population was 65,834 at the 2010 census. It is the county seat of Howard County...
Owings Mills, Maryland
Owings Mills, Maryland
Owings Mills is an unincorporated community and a census-designated place in Baltimore County, Maryland, United States. It is a suburb of Baltimore. The population was 20,193 at the 2000 census. Owings Mills is home to the northern terminus for the Baltimore Metro Subway and to Owings Mills Mall....

Washington area

Washington, D.C.
Washington, D.C.
Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....
Bethesda, Maryland
Bethesda, Maryland
Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...
College Park, Maryland
College Park, Maryland
College Park is a city in Prince George's County, Maryland, USA. The population was 30,413 at the 2010 census. It is best known as the home of the University of Maryland, College Park, and since 1994 the city has also been home to the "Archives II" facility of the U.S...
Frederick, Maryland
Frederick, Maryland
Frederick is a city in north-central Maryland. It is the county seat of Frederick County, the largest county by area in the state of Maryland. Frederick is an outlying community of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area, which is part of a greater...
Gaithersburg, Maryland
Gaithersburg, Maryland
Gaithersburg is a city in Montgomery County, Maryland, United States. The city had a population of 59,933 at the 2010 census, making it the fourth largest incorporated city in the state, behind Baltimore, Frederick, and Rockville...
Laurel, Maryland
Laurel, Maryland
Laurel is a city in northern Prince George's County, Anne Arundel County, and Howard County, Maryland, United States, located midway between Washington, D.C. and Baltimore. Incorporated in 1870, the city maintains a historic district including its Main Street...
Potomac, Maryland
Potomac, Maryland
Potomac is a census-designated place in Montgomery County, Maryland, United States, named for the nearby Potomac River. The population was 44,822 at the 2000 census. The Potomac area is known for its very affluent and highly-educated residents. In 2009 CNNMoney.com listed Potomac as the fourth...
Rockville, Maryland
Rockville, Maryland
Rockville is the county seat of Montgomery County, Maryland, United States. It is a major incorporated city in the central part of Montgomery County and forms part of the Baltimore-Washington Metropolitan Area. The 2010 U.S...
Silver Spring, Maryland
Silver Spring, Maryland
Silver Spring is an unincorporated area and census-designated place in Montgomery County, Maryland, United States. It had a population of 71,452 at the 2010 census, making it the fourth most populous place in Maryland, after Baltimore, Columbia, and Germantown.The urbanized, oldest, and...
Upper Marlboro, Maryland
Upper Marlboro, Maryland
Upper Marlboro is a town in and the county seat of Prince George's County, Maryland, United States. The live-in population of the town core proper was only 648 at the 2000 census, although Greater Upper Marlboro is many times larger....
Alexandria, Virginia
Alexandria, Virginia
Alexandria is an independent city in the Commonwealth of Virginia. As of 2009, the city had a total population of 139,966. Located along the Western bank of the Potomac River, Alexandria is approximately six miles south of downtown Washington, D.C.Like the rest of northern Virginia, as well as...
McLean, Virginia
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....
Reston, Virginia
Reston, Virginia
Reston is a census-designated place in Fairfax County, Virginia, United States, within the Washington, D.C. metropolitan area. The population was 58,404, at the 2010 Census and 56,407 at the 2000 census...

Biotechnology

Not limited to its proximity to the National Institutes of Health

National Institutes of Health

The National Institutes of Health are an agency of the United States Department of Health and Human Services and are the primary agency of the United States government responsible for biomedical and health-related research. Its science and engineering counterpart is the National Science Foundation...

, Maryland's Washington suburbs are a major center for biotechnology

Biotechnology

Biotechnology is a field of applied biology that involves the use of living organisms and bioprocesses in engineering, technology, medicine and other fields requiring bioproducts. Biotechnology also utilizes these products for manufacturing purpose...

. Prominent local biotechnology companies include MedImmune

MedImmune

MedImmune, LLC, headquartered in Gaithersburg, Maryland, became a wholly owned subsidiary of AstraZeneca in 2007. Since being acquired, MedImmune has remained a Maryland-based biotechnology development enterprise...

, United Therapeutics, The Institute for Genomic Research

The Institute for Genomic Research

The Institute for Genomic Research was a non-profit genomics research institute founded in 1992 by Craig Venter in Rockville, Maryland, United States. It is now a part of the J. Craig Venter Institute.-History:...

, Human Genome Sciences

Human Genome Sciences

Human Genome Sciences is a biopharmaceutical corporation founded in 1992. It uses the human DNA sequence to develop protein and antibody drugs. As of 2008, it has drugs under development to treat such diseases as hepatitis C, systemic lupus erythmatosis, anthrax disease, cancer, rheumatoid...

and the Howard Hughes Medical Institute

Howard Hughes Medical Institute

Howard Hughes Medical Institute is a United States non-profit medical research organization based in Chevy Chase, Maryland. It was founded by the American businessman Howard Hughes in 1953. It is one of the largest private funding organizations for biological and medical research in the United...

Defense contracting

Many defense contractors are based in the region to be close to the Pentagon

The Pentagon

The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.Designed by the American architect...

in Arlington. Local defense contractors include Lockheed Martin

Lockheed Martin

Lockheed Martin is an American global aerospace, defense, security, and advanced technology company with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It is headquartered in Bethesda, Maryland, in the Washington Metropolitan Area....

, the largest, as well as General Dynamics

General Dynamics

General Dynamics Corporation is a U.S. defense conglomerate formed by mergers and divestitures, and as of 2008 it is the fifth largest defense contractor in the world. Its headquarters are in West Falls Church , unincorporated Fairfax County, Virginia, in the Falls Church area.The company has...

, Computer Sciences Corporation (CSC)

Computer Sciences Corporation

Computer Sciences Corporation is an American information technology and business services company headquartered in Falls Church, Virginia, USA...

, Science Applications International Corporation (SAIC)

Science Applications International Corporation

SAIC is a FORTUNE 500 scientific, engineering and technology applications company headquartered in the United States with numerous federal, state, and private sector clients...

, and Orbital Sciences Corporation

Orbital Sciences Corporation

Orbital Sciences Corporation is an American company which specializes in the manufacturing and launch of satellites. Its Launch Systems Group is heavily involved with missile defense launch systems...

Maryland

Baltimore area:

ARINC
ARINC
Aeronautical Radio, Incorporated , established in 1929, is a major provider of transport communications and systems engineering solutions for eight industries: aviation, airports, defense, government, healthcare, networks, security, and transportation...

(Annapolis
Annapolis, Maryland
Annapolis is the capital of the U.S. state of Maryland, as well as the county seat of Anne Arundel County. It had a population of 38,394 at the 2010 census and is situated on the Chesapeake Bay at the mouth of the Severn River, south of Baltimore and about east of Washington, D.C. Annapolis is...

)
Constellation Energy
Constellation Energy
Constellation Energy, headquartered in Baltimore, Maryland, is an energy producer, trader, and distributor. The company operates over 35 power plants in 11 states under its operating company Constellation Commodities Group and/or Constellation Generation Group...

(Baltimore
Baltimore
Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...

) 125
Fila
Fila (company)
Fila is one of the world's largest sportswear manufacturing companies. Founded in 1911 in Italy, Fila has been owned and operated from South Korea since a takeover in 2007. Headed by chairman and CEO Yoon-Soo Yoon, Fila now has offices in 11 countries worldwide....

USA (Sparks
Sparks, Maryland
Sparks is an unincorporated community that is located in Baltimore County, Maryland, United States. It is situated approximately 20 miles north of Baltimore, Maryland and is considered to be a suburb of the City of Baltimore...

)
Legg Mason
Legg Mason
Legg Mason, Inc. is an American-based global investment management firm with a focus on asset management. The company’s business is divided in two divisions: Americas and International...

(Baltimore
Baltimore
Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...

) 500
McCormick & Company
McCormick & Company
McCormick & Company manufactures spices, herbs, and flavorings for retail, commercial, and industrial markets. The company began in 1889 in Baltimore, Maryland, United States. One hundred years later, McCormick moved from downtown Baltimore to the suburb of Hunt Valley, Maryland. McCormick has...

(Hunt Valley
Hunt Valley, Maryland
Hunt Valley is an affluent unincorporated community in Baltimore County, Maryland, United States. It lies just north of the city of Baltimore, along Highway 145 off Interstate 83. Loch Raven Reservoir...

)
New Enterprise Associates
New Enterprise Associates
New Enterprise Associates is a global investment firm focused on venture capital and growth equity investments. With approximately $11 billion in committed capital, NEA is among the largest venture firms. The firm invests in three broad industry sectors: information technology, healthcare, and...

(Baltimore
Baltimore
Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...

)
T. Rowe Price
T. Rowe Price
T. Rowe Price is a publicly owned Investment firm, headquartered in Baltimore, Maryland. It was founded in 1937 by Thomas Rowe Price, Jr.. The company offers mutual funds, subadvisory services, and separate account management for individuals, institutions, retirement plans, and financial...

(Baltimore
Baltimore
Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...

)
Under Armour
Under Armour
Under Armour is an American sports clothing and accessories company. The company is a supplier of a wide range of sportswear and casual apparel mainly focusing on hi-tech sportswear for professional athletes...

(Baltimore
Baltimore
Baltimore is the largest independent city in the United States and the largest city and cultural center of the US state of Maryland. The city is located in central Maryland along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Baltimore is sometimes referred to as Baltimore...

)

Washington area:

BAE Systems Inc.
BAE Systems Inc.
BAE Systems Inc. is a major subsidiary of the British defense and aerospace company BAE Systems plc. As per its Special Security Agreement, BAE Systems Inc...

(Rockville
Rockville, Maryland
Rockville is the county seat of Montgomery County, Maryland, United States. It is a major incorporated city in the central part of Montgomery County and forms part of the Baltimore-Washington Metropolitan Area. The 2010 U.S...

)
Bethesda Softworks
Bethesda Softworks
Bethesda Softworks, LLC, is an American video game company. A subsidiary of ZeniMax Media, the company was originally based in Bethesda, Maryland and eventually moved to their current location in Rockville, Maryland...

(Rockville
Rockville, Maryland
Rockville is the county seat of Montgomery County, Maryland, United States. It is a major incorporated city in the central part of Montgomery County and forms part of the Baltimore-Washington Metropolitan Area. The 2010 U.S...

)
Choice Hotels
Choice Hotels
Choice Hotels International is a hospitality holding corporation which is affiliated with several hotel brands and is based in Silver Spring, Maryland...

(Silver Spring
Silver Spring, Maryland
Silver Spring is an unincorporated area and census-designated place in Montgomery County, Maryland, United States. It had a population of 71,452 at the 2010 census, making it the fourth most populous place in Maryland, after Baltimore, Columbia, and Germantown.The urbanized, oldest, and...

)
Coventry Health Care
Coventry Health Care
Coventry Health Care, Inc. is a diversified national insurer in the United States.Based in Bethesda, Maryland, Coventry operates health plans, insurance companies, network rental and workers’ compensation services companies...

(Bethesda
Bethesda, Maryland
Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...

) 226
Discovery Communications
Discovery Communications
Discovery Communications, Inc. is an American global media and entertainment company. The company started as a single channel in 1985, The Discovery Channel. Today, DCI has global operations offering 28 network entertainment brands on more than 100 channels in more than 180 countries in 39...

(Silver Spring
Silver Spring, Maryland
Silver Spring is an unincorporated area and census-designated place in Montgomery County, Maryland, United States. It had a population of 71,452 at the 2010 census, making it the fourth most populous place in Maryland, after Baltimore, Columbia, and Germantown.The urbanized, oldest, and...

)
GEICO
GEICO
The Government Employees Insurance Company is an auto insurance company. It is a wholly owned subsidiary of Berkshire Hathaway that as of 2007 provided coverage for more than 10 million motor vehicles owned by more than 9 million policy holders. GEICO writes private passenger automobile insurance...

(Chevy Chase
Chevy Chase, Maryland
Chevy Chase is the name of both a town and an unincorporated census-designated place in Montgomery County, Maryland. In addition, a number of villages in the same area of Montgomery County include "Chevy Chase" in their names...

)
Host Hotels & Resorts
Host Hotels & Resorts
Host Hotels & Resorts is a real estate investment trust and the owner of lodging real estate based in Bethesda, Maryland.-History:Host Hotels & Resorts was formed in 1992 when the Marriott Corporation split into two separate entities, creating Marriott International and Host Marriott...

(Bethesda
Bethesda, Maryland
Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...

) 449
Hughes Network Systems (Germantown
Germantown, Montgomery County, Maryland
-Demographics:As of the census of 2010, there were 86,395 people, and 30,531 households residing in the area. The population density was 7,999.5 people per square mile . There were 31,807 housing units at an average density of 2,001.9 per square mile...

)
Lockheed Martin
Lockheed Martin
Lockheed Martin is an American global aerospace, defense, security, and advanced technology company with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It is headquartered in Bethesda, Maryland, in the Washington Metropolitan Area....

(Bethesda
Bethesda, Maryland
Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...

) 54
Marriott International
Marriott International
Marriott International, Inc. is a worldwide operator and franchisor of a broad portfolio of hotels and related lodging facilities. Founded by J. Willard Marriott, the company is now led by son J.W. Marriott, Jr...

(Bethesda
Bethesda, Maryland
Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...

) 208
MedImmune
MedImmune
MedImmune, LLC, headquartered in Gaithersburg, Maryland, became a wholly owned subsidiary of AstraZeneca in 2007. Since being acquired, MedImmune has remained a Maryland-based biotechnology development enterprise...

(Gaithersburg
Gaithersburg, Maryland
Gaithersburg is a city in Montgomery County, Maryland, United States. The city had a population of 59,933 at the 2010 census, making it the fourth largest incorporated city in the state, behind Baltimore, Frederick, and Rockville...

)
Radio One (Lanham
Lanham, Maryland
Lanham is an unincorporated community in Prince George's County in the State of Maryland in the United States of America. Because it is not formally incorporated, it has no official boundaries, but the United States Census Bureau has defined a census-designated place consisting of Lanham and the...

)
Ritz-Carlton
Ritz-Carlton
The Ritz-Carlton is a brand of luxury hotels and resorts with 75 properties located in major cities and resorts in 24 countries worldwide...

(Chevy Chase
Chevy Chase, Maryland
Chevy Chase is the name of both a town and an unincorporated census-designated place in Montgomery County, Maryland. In addition, a number of villages in the same area of Montgomery County include "Chevy Chase" in their names...

)
TV One (Silver Spring
Silver Spring, Maryland
Silver Spring is an unincorporated area and census-designated place in Montgomery County, Maryland, United States. It had a population of 71,452 at the 2010 census, making it the fourth most populous place in Maryland, after Baltimore, Columbia, and Germantown.The urbanized, oldest, and...

)

Washington, D.C.

Black Entertainment Television
Black Entertainment Television
Black Entertainment Television is an American, Viacom-owned cable network based in Washington, D.C.. Currently viewed in more than 90 million homes worldwide, it is the most prominent television network targeting young Black-American audiences. The network was launched on January 25, 1980, by its...
Bureau of National Affairs
Bureau of National Affairs
The Bureau of National Affairs, Inc. — known as BNA — is an independent, privately owned publisher of specialized online and print news and information for professionals in business and government, headquartered in Arlington, Virginia, USA...
Carlyle Group
Carlyle Group
The Carlyle Group is an American-based global asset management firm, specializing in private equity, based in Washington, D.C. The Carlyle Group operates in four business areas: corporate private equity, real assets, market strategies and fund-of-funds, through its AlpInvest subsidiary...
Danaher Corporation
Danaher Corporation
The Danaher Corporation , is a large global company headquartered in Washington, D.C., United States. Its products are concentrated in the fields of design, manufacture, and marketing of industrial and consumer products....

239
Fannie Mae 53
National Geographic Society
National Geographic Society
The National Geographic Society , headquartered in Washington, D.C. in the United States, is one of the largest non-profit scientific and educational institutions in the world. Its interests include geography, archaeology and natural science, the promotion of environmental and historical...
Pepco Holdings
Pepco Holdings
Pepco Holdings, Inc. is a holding company incorporated in February of 2001 for the purpose of effecting the acquisition of Conectiv Power Delivery by Potomac Electric Power Company . The acquisition was completed on August 1, 2002 at which time Pepco and Conectiv became wholly owned subsidiaries...

279
The Washington Post Company
XM Satellite Radio
XM Satellite Radio
XM Satellite Radio is one of two satellite radio services in the United States and Canada, operated by Sirius XM Radio. It provides pay-for-service radio, analogous to cable television. Its service includes 73 different music channels, 39 news, sports, talk and entertainment channels, 21 regional...

Northern Virginia

AES Corporation
AES Corporation
AES Corporation is a Fortune 500 company that generates and distributes electrical power. The company was founded on January 28, 1981, as Applied Energy Services by Roger Sant from the US Federal Energy Administration and Dennis Bakke from the Office of Management and Budget. AES Corporation is...

(Arlington
Arlington County, Virginia
Arlington County is a county in the Commonwealth of Virginia. The land that became Arlington was originally donated by Virginia to the United States government to form part of the new federal capital district. On February 27, 1801, the United States Congress organized the area as a subdivision of...

) 158
Airbus
Airbus
Airbus SAS is an aircraft manufacturing subsidiary of EADS, a European aerospace company. Based in Blagnac, France, surburb of Toulouse, and with significant activity across Europe, the company produces around half of the world's jet airliners....

North America (Herndon
Herndon, Virginia
Herndon is a town in Fairfax County, Virginia, in the Washington, D.C. metropolitan area of the United States. The population was 21,655 at the 2000 census, which makes it the largest of three towns in the county.-History:...

)
BearingPoint
BearingPoint
BearingPoint is an independent management and technology consulting firm. Following a post-bankruptcy management buyout in August 2009, BearingPoint has been operated by its European management team and is organized as a partnership...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

)
Booz Allen Hamilton
Booz Allen Hamilton
Booz Allen Hamilton Inc. , or more commonly Booz Allen, is an American public consulting firm headquartered in McLean, Fairfax County, Virginia, with 80 other offices throughout the United States. Ralph Shrader is its Chairman and Chief Executive Officer. The firm was founded by Edwin Booz in...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

) 438
CACI
CACI
CACI International Inc is a professional services and information technology company headquartered in Arlington, Virginia. CACI is a member of the Fortune 1000 Largest Companies and the Russell 2000 index. The company has approximately 13,700 employees in over 120 offices in the U.S. and...

(Arlington
Arlington County, Virginia
Arlington County is a county in the Commonwealth of Virginia. The land that became Arlington was originally donated by Virginia to the United States government to form part of the new federal capital district. On February 27, 1801, the United States Congress organized the area as a subdivision of...

)
Capital One
Capital One
Capital One Financial Corp. is a U.S.-based bank holding company specializing in credit cards, home loans, auto loans, banking and savings products...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

) 145
Computer Sciences Corporation
Computer Sciences Corporation
Computer Sciences Corporation is an American information technology and business services company headquartered in Falls Church, Virginia, USA...

(Falls Church
Falls Church, Virginia
The City of Falls Church is an independent city in Virginia, United States, in the Washington Metropolitan Area. The city population was 12,332 in 2010, up from 10,377 in 2000. Taking its name from The Falls Church, an 18th-century Anglican parish, Falls Church gained township status within...

) 153
DynCorp International
DynCorp International
DynCorp International is a United States-based private military contractor. Begun as an aviation company, the company now also provides air operations support, training and mentoring, international development, intelligence training and support, contingency operations, security, and operations and...

(Falls Church
Falls Church, Virginia
The City of Falls Church is an independent city in Virginia, United States, in the Washington Metropolitan Area. The city population was 12,332 in 2010, up from 10,377 in 2000. Taking its name from The Falls Church, an 18th-century Anglican parish, Falls Church gained township status within...

)
Freddie Mac (McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

) 220
FNH
Fabrique Nationale de Herstal
Fabrique Nationale d'Herstal — self identified as FN Herstal and often referred to as Fabrique Nationale or simply FN — is a firearms manufacturer located in Herstal, Belgium....

USA (Fredericksburg
Fredericksburg, Virginia
Fredericksburg is an independent city in the Commonwealth of Virginia located south of Washington, D.C., and north of Richmond. As of the 2010 census, the city had a population of 24,286...

)
Gannett Company
Gannett Company
Gannett Company, Inc. is a publicly-traded media holding company headquartered in Tysons Corner, Virginia, United States, near McLean. It is the largest U.S. newspaper publisher as measured by total daily circulation. Its assets include the national newspaper USA Today and the weekly USA Weekend...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

) 371
General Dynamics
General Dynamics
General Dynamics Corporation is a U.S. defense conglomerate formed by mergers and divestitures, and as of 2008 it is the fifth largest defense contractor in the world. Its headquarters are in West Falls Church , unincorporated Fairfax County, Virginia, in the Falls Church area.The company has...

(Falls Church
Falls Church, Virginia
The City of Falls Church is an independent city in Virginia, United States, in the Washington Metropolitan Area. The city population was 12,332 in 2010, up from 10,377 in 2000. Taking its name from The Falls Church, an 18th-century Anglican parish, Falls Church gained township status within...

) 83
Hilton Hotels Corporation
Hilton Hotels Corporation
Hilton Worldwide is a global hospitality company. It is owned by the Blackstone Group, a private equity firm. As of July 2011 Hilton brands encompass 3,750 hotels with over 600,000 rooms in 84 countries...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

)
Kellogg Brown and Root Services (Arlington
Arlington County, Virginia
Arlington County is a county in the Commonwealth of Virginia. The land that became Arlington was originally donated by Virginia to the United States government to form part of the new federal capital district. On February 27, 1801, the United States Congress organized the area as a subdivision of...

)
Mars, Incorporated
Mars, Incorporated
Mars, Incorporated is a worldwide manufacturer of confectionery, pet food, and other food products with US$30 billion in annual sales in 2010, and is ranked as the 5th largest privately held company in the United States by Forbes. Headquartered in McLean, unincorporated Fairfax County, Virginia,...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

)
MicroStrategy
MicroStrategy
MicroStrategy, Inc. , is a business intelligence software vendor. MicroStrategy's software enables leading organizations worldwide to analyze the vast amounts of data stored across their enterprises to make more strategic business decisions...

(Tysons Corner
Tysons Corner, Virginia
Tysons Corner is an unincorporated census-designated place in Fairfax County, Virginia, United States. Part of the Washington Metropolitan Area located in Northern Virginia, Tysons Corner lies between the community of McLean and the town of Vienna along the Capital Beltway . The population was...

)
Navy Federal Credit Union
Navy Federal Credit Union
Navy Federal Credit Union is a credit union headquartered in Vienna, Virginia, chartered and regulated under the authority of the National Credit Union Administration of the U.S. federal government. Navy Federal is the largest natural member credit union in the world, both in asset size and in...

(Vienna
Vienna, Virginia
Vienna is a town in Fairfax County, Virginia, United States. As of the 2010 United States Census, it had a population of 15,687. Significantly more people live in zip codes with the Vienna postal addresses bordered approximately by Interstate 66 on the south, Interstate 495 on the east, Route 7 to...

)
NII Holdings
NII Holdings
NII Holdings Inc. , a publicly held company based in Reston, Va., provides mobile communications for business customers in Latin America. NII, which operates under the Nextel brand, has operations in Argentina, Brazil, Chile, Mexico and Peru and offers fully integrated wireless communications...

(Reston
Reston, Virginia
Reston is a census-designated place in Fairfax County, Virginia, United States, within the Washington, D.C. metropolitan area. The population was 58,404, at the 2010 Census and 56,407 at the 2000 census...

)
NVR Incorporated (Reston
Reston, Virginia
Reston is a census-designated place in Fairfax County, Virginia, United States, within the Washington, D.C. metropolitan area. The population was 58,404, at the 2010 Census and 56,407 at the 2000 census...

) 464
Orbital Sciences
Orbital Sciences Corporation
Orbital Sciences Corporation is an American company which specializes in the manufacturing and launch of satellites. Its Launch Systems Group is heavily involved with missile defense launch systems...

(Dulles
Dulles, Virginia
Dulles, Virginia is an unincorporated area located in Loudoun County, Virginia, part of the Washington Metropolitan Area. The headquarters of Orbital Sciences Corporation, GeoEye, and ODIN technologies and the former headquarters of MCI Inc...

)
Rolls-Royce North America
Rolls-Royce North America
Rolls-Royce North America, Inc. is a subsidiary of Rolls-Royce plc involved principally in the manufacture of gas turbine engines and other propulsion systems...

(Reston
Reston, Virginia
Reston is a census-designated place in Fairfax County, Virginia, United States, within the Washington, D.C. metropolitan area. The population was 58,404, at the 2010 Census and 56,407 at the 2000 census...

)
Science Applications International Corporation
Science Applications International Corporation
SAIC is a FORTUNE 500 scientific, engineering and technology applications company headquartered in the United States with numerous federal, state, and private sector clients...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

) 266
Space Adventures
Space Adventures
Space Adventures, Ltd. is a Virginia, USA-based space tourism company founded in 1998 by Eric C. Anderson. , offerings include zero-gravity atmospheric flights, orbital spaceflights , and other spaceflight-related experiences including cosmonaut training, spacewalk training, and launch tours...

(Vienna
Vienna, Virginia
Vienna is a town in Fairfax County, Virginia, United States. As of the 2010 United States Census, it had a population of 15,687. Significantly more people live in zip codes with the Vienna postal addresses bordered approximately by Interstate 66 on the south, Interstate 495 on the east, Route 7 to...

)
SLM Corporation
SLM Corporation
SLM Corporation is a publicly traded U.S. corporation whose operations are originating, servicing and collecting on student loans.Managing more than $180.4 billion in debt for more than 10 million borrowers, the company primarily provided federally guaranteed student loans originated under the...

(Reston
Reston, Virginia
Reston is a census-designated place in Fairfax County, Virginia, United States, within the Washington, D.C. metropolitan area. The population was 58,404, at the 2010 Census and 56,407 at the 2000 census...

) "Sallie Mae" 331
USA Today
USA Today
USA Today is a national American daily newspaper published by the Gannett Company. It was founded by Al Neuharth. The newspaper vies with The Wall Street Journal for the position of having the widest circulation of any newspaper in the United States, something it previously held since 2003...

(McLean
McLean, Virginia
McLean is an unincorporated community and census-designated place in Fairfax County in Northern Virginia. The community had a total population of 48,115 as of the 2010 census....

)
Verizon Business
Verizon Business
Verizon Business is one of three operating units of Verizon Communications It was created in 2006 when Verizon Communications closed on its merger with MCI, Inc..Verizon Business has over 30,000 employees with 321 offices in 75 countries...

(Ashburn
Ashburn, Virginia
Ashburn, Virginia is a census-designated place located in Loudoun County, Virginia, northwest of Washington, D.C., and is part of the Washington Metropolitan Area...

)
Volkswagen Group of America (Herndon
Herndon, Virginia
Herndon is a town in Fairfax County, Virginia, in the Washington, D.C. metropolitan area of the United States. The population was 21,655 at the 2000 census, which makes it the largest of three towns in the county.-History:...

)
XO Communications
XO Communications
XO Communications is a telecommunications company owned by XO Holdings, Inc...

(Herndon
Herndon, Virginia
Herndon is a town in Fairfax County, Virginia, in the Washington, D.C. metropolitan area of the United States. The population was 21,655 at the 2000 census, which makes it the largest of three towns in the county.-History:...

)

Transportation

Major airports

Baltimore-Washington International Thurgood Marshall Airport
Baltimore-Washington International Thurgood Marshall Airport
Baltimore/Washington International Thurgood Marshall Airport is an international airport serving the Baltimore-Washington Metropolitan Area in the United States. It is commonly called BWI, BWI Airport or BWI Marshall, BWI being an initialism for "Baltimore/Washington International" and the...

(Anne Arundel County, Maryland
Anne Arundel County, Maryland
Anne Arundel County is a county located in the U.S. state of Maryland. It is named for Anne Arundell , a member of the ancient family of Arundells in Cornwall, England and the wife of Cæcilius Calvert, 2nd Baron Baltimore. Its county seat is Annapolis, which is also the capital of the state...

– closest to Baltimore)
Ronald Reagan Washington National Airport
Ronald Reagan Washington National Airport
Ronald Reagan Washington National Airport is a public airport located south of downtown Washington, D.C., in Arlington County, Virginia. It is the commercial airport nearest to Washington, D.C. For many decades, it was called Washington National Airport, but this airport was renamed in 1998 to...

(Arlington County, Virginia
Arlington County, Virginia
Arlington County is a county in the Commonwealth of Virginia. The land that became Arlington was originally donated by Virginia to the United States government to form part of the new federal capital district. On February 27, 1801, the United States Congress organized the area as a subdivision of...

– closest to Washington)
Washington Dulles International Airport
Washington Dulles International Airport
Washington Dulles International Airport is a public airport in Dulles, Virginia, 26 miles west of downtown Washington, D.C. The airport serves the Baltimore-Washington-Northern Virginia metropolitan area centered on the District of Columbia. It is named after John Foster Dulles, Secretary of...

(Chantilly, Virginia
Chantilly, Virginia
Chantilly is an unincorporated community located in western Fairfax County and southeastern Loudoun County of Northern Virginia. Recognized by the U.S. Census Bureau as a census designated place , the community population was 23,039 as of the 2010 census -- down from 41,041 in 2000, due to the...

– busiest in region)

Rail transit systems

Amtrak
Amtrak
The National Railroad Passenger Corporation, doing business as Amtrak , is a government-owned corporation that was organized on May 1, 1971, to provide intercity passenger train service in the United States. "Amtrak" is a portmanteau of the words "America" and "track". It is headquartered at Union...
Washington Metro
Washington Metro
The Washington Metro, commonly called Metro, and unofficially Metrorail, is the rapid transit system in Washington, D.C., United States, and its surrounding suburbs. It is administered by the Washington Metropolitan Area Transit Authority , which also operates Metrobus service under the Metro name...
MARC Train
MARC Train
MARC , known prior to 1984 as Maryland Rail Commuter Service, is a regional rail system comprising three lines in the Baltimore-Washington Metropolitan Area. MARC is administered by the Maryland Transit Administration , a Maryland Department of Transportation agency, and is operated under contract...
Baltimore Light Rail
Baltimore Light Rail
The Maryland Transit Administration Light Rail is a light rail system serving Baltimore, Maryland, United States, and the surrounding suburbs.In downtown Baltimore it uses city streets...
Metro Subway
Virginia Railway Express
Virginia Railway Express
The Virginia Railway Express is a regional/ commuter rail service that connects the Northern Virginia suburbs to Union Station in Washington, D.C., via two lines: the Fredericksburg Line from Fredericksburg, Virginia, and the Manassas Line from Broad Run/Airport station in Bristow,...

Major highways

Interstates

Interstate 66
Interstate 66
Interstate 66 is an Interstate Highway in the eastern United States. As indicated by its even route number, it runs in an east–west direction. Its western terminus is at Middletown, Virginia, at an intersection with Interstate 81; its eastern terminus is in Washington, D.C., at an...
Interstate 70
Interstate 70
Interstate 70 is an Interstate Highway in the United States that runs from Interstate 15 near Cove Fort, Utah, to a Park and Ride near Baltimore, Maryland. It was the first Interstate Highway project in the United States. I-70 approximately traces the path of U.S. Route 40 east of the Rocky...
Interstate 81
Interstate 81
Interstate 81 is an Interstate Highway in the eastern part of the United States. Its southern terminus is at Interstate 40 in Dandridge, Tennessee; its northern terminus is on Wellesley Island at the Canadian border, where the Thousand Islands Bridge connects it to Highway 401, the main freeway...
Interstate 83
Interstate 83
Interstate 83 is an Interstate Highway in the eastern United States. Its southern terminus is in Baltimore, Maryland at the Fayette Street exit; its northern terminus is in Harrisburg, Pennsylvania at Interstate 81....
Interstate 95
Interstate 95
Interstate 95 is the main highway on the East Coast of the United States, running parallel to the Atlantic Ocean from Maine to Florida and serving some of the most populated urban areas in the country, including Boston, Providence, New Haven, New York City, Newark, Philadelphia, Baltimore,...
Interstate 97
Interstate 97
Interstate 97 is an intrastate Interstate Highway located entirely within Anne Arundel County, Maryland, United States. It runs from Annapolis at the overlapped section of US 50, US 301, and the unsigned I-595 to Baltimore at the city's beltway...
Interstate 195
Interstate 195 (Maryland)
Interstate 195 is an Interstate highway in the U.S. state of Maryland. Known as Metropolitan Boulevard, the highway runs from Baltimore/Washington International Thurgood Marshall Airport in Linthicum north to I-95 in Arbutus, where Metropolitan Boulevard continues north as Maryland Route 166 ,...
Interstate 270
Interstate 270 (Maryland)
Interstate 270 is a auxiliary Interstate Highway in the U.S. state of Maryland that travels between Interstate 495 just north of Bethesda, Montgomery County and Interstate 70 in the city of Frederick in Frederick County. It consists of the mainline as well as a spur that provides access to and...
Interstate 295
Interstate 295 (District of Columbia)
Interstate 295 in the U.S. state of Maryland and in Washington, D.C. is a spur route connecting I-95/I-495 and Maryland Route 210 on the Potomac River to Interstate 695 in downtown Washington.-Route description:Although I-295 technically begins at the Capital Beltway , a pair of mainline...
Interstate 370
Interstate 370
Interstate 370 is a Interstate Highway spur route off I-270 in Gaithersburg, Maryland to the western end of toll road MD 200 at an interchange that provides access to the park and ride lot at the Shady Grove station on the Red Line of the Washington Metro. Despite the number, I-370 does not...
Interstate 395 (District of Columbia-Virginia)
Interstate 395 (District of Columbia-Virginia)
Interstate 395 in Washington, D.C., and Virginia is a 13 mile long spur route that begins at a junction with Interstate 95 in Springfield, Virginia and ends in northwest Washington, D.C. It passes underneath the National Mall near the United States Capitol and ends at a junction with U.S...
Interstate 395 (Maryland)
Interstate 395 (Maryland)
Interstate 395 is an Interstate Highway in the U.S. state of Maryland. Known as Cal Ripken Way, the highway runs from I-95 north to Howard Street and Camden Street in Baltimore. I-395 is a spur that heads north from I-95 over the Middle Branch of the Patapsco River toward Downtown Baltimore,...
Interstate 495
Interstate 495 (Capital Beltway)
Interstate 495 is a Interstate Highway that surrounds the United States' capital of Washington, D.C., and its inner suburbs in adjacent Maryland and Virginia. I-495 is widely known as the Capital Beltway or simply the Beltway, especially when the context of Washington, D.C., is clear...

(Capital Beltway)
Interstate 695
Interstate 695 (Maryland)
Interstate 695 is a -long full beltway Interstate Highway extending around Baltimore, Maryland, USA. I-695 is officially designated the McKeldin Beltway, but is colloquially referred to as either the Baltimore Beltway or 695...

(Baltimore Beltway)
Interstate 795
Interstate 795 (Maryland)
Interstate 795 , also known as the Northwest Expressway, is a nine-mile freeway linking Baltimore's northwestern suburbs of Pikesville, Owings Mills and Reisterstown, Maryland to the Baltimore Beltway...
Interstate 895
Interstate 895 (Maryland)
Interstate 895 is an Interstate Highway in the U.S. state of Maryland. Known as the Harbor Tunnel Thruway, the highway runs between one junction with I-95 in Elkridge and another interchange with I-95 on the east side of Baltimore. I-895 is a toll road that crosses the Patapsco River estuary...

U.S. Routes

U.S. Route 1
U.S. Route 1
U.S. Route 1 is a major north–south U.S. Highway that serves the East Coast of the United States. It runs 2,377 miles from Fort Kent, Maine at the Canadian border south to Key West, Florida. U.S. 1 generally parallels Interstate 95, though it is significantly farther west between...
U.S. Route 11
U.S. Route 11
U.S. Route 11 is a north–south United States highway extending 1,645 miles across the eastern United States. The southern terminus of the route is at U.S. Route 90 in the Bayou Sauvage National Wildlife Refuge in eastern New Orleans, Louisiana. The northern terminus is at the United...
U.S. Route 15
U.S. Route 15
U.S. Route 15 is a -long United States highway, designated along South Carolina, North Carolina, Virginia, Maryland, Pennsylvania, and New York. The route is signed north–south, from U.S. Route 17 Alternate in Walterboro, South Carolina to Interstate 86 and NY 17 in Painted Post, New York.US...
U.S. Route 29
U.S. Route 29
U.S. Route 29 is a north–south United States highway that runs for from the western suburbs of Baltimore, Maryland, to Pensacola, Florida. This highway's northern terminus is at Maryland Route 99 in Ellicott City, Maryland...
U.S. Route 40
U.S. Route 40
U.S. Route 40 is an east–west United States highway. As with most routes whose numbers end in a zero, U.S. 40 once traversed the entire United States. It is one of the original 1920s U.S. Highways, and its first termini were San Francisco, California, and Atlantic City, New Jersey...
U.S. Route 50
U.S. Route 50
U.S. Route 50 is a major east–west route of the U.S. Highway system, stretching just over from Ocean City, Maryland on the Atlantic Ocean to West Sacramento, California. Until 1972, when it was replaced by Interstate Highways west of the Sacramento area, it extended to San Francisco, near...
U.S. Route 340
U.S. Route 340
U.S. Route 340 is a spur of US 40. It currently runs for from Greenville, Virginia at US 11 to Frederick, Maryland at US 40. Between those two states, US 340 also passes briefly through West Virginia. In Virginia and West Virginia, it is signed north–south...

State Routes

Maryland Route 2
Maryland Route 2
Maryland Route 2 is the longest state highway in the U.S. state of Maryland. The route runs from Solomons Island in Calvert County north to an intersection with U.S. Route 1 and U.S. Route 40 Truck in Baltimore...
Maryland Route 4
Maryland Route 4
Maryland Route 4 is a state highway in the U.S. state of Maryland. The state highway runs from MD 5 in Leonardtown north to Southern Avenue at the Washington, D.C. border, past which the highway continues as Pennsylvania Avenue...
Maryland Route 26
Maryland Route 26
Maryland Route 26 is an east–west state highway in the U.S. state of Maryland. Outside of the Baltimore city limits, it is known as Liberty Road; inside the city limits it is known as Liberty Heights Avenue....
Maryland Route 32
Maryland Route 32
Maryland Route 32 is a state highway in the U.S. state of Maryland. The state highway runs from Interstate 97 and MD 3 in Millersville west and north to Washington Road in Westminster. The east–west portion of MD 32 is the Patuxent Freeway, a four- to six-lane...
Maryland Route 100
Maryland Route 100
Maryland Route 100 is a major east–west highway connecting U.S. Route 29 in Ellicott City and MD 177 in Pasadena. MD 100 also connects to Interstate 95 , US 1, the Baltimore-Washington Parkway , and I-97...
Maryland Route 200/InterCounty Connector
Intercounty Connector
Maryland Route 200 , more commonly known as the Intercounty Connector or ICC, is a partially completed toll freeway under construction in Maryland which connects Gaithersburg in Montgomery County and Laurel in Prince George's County. When completed, it will reach the community of Konterra just...
Baltimore–Washington Parkway/Maryland Route 295
Maryland Route 355
Maryland Route 355
Maryland Route 355 is a north–south road in western central Maryland in the United States. The southern terminus of the route is at the Washington, D.C. border in Friendship Heights, Montgomery County, where it continues south as Wisconsin Avenue into Washington. The northern terminus is...

Virginia State Route 7
Virginia State Route 7
State Route 7 is a major primary state highway and busy commuter route in Northern Virginia, United States. It travels southeast from downtown Winchester to State Route 400 in downtown Alexandria...
Virginia State Route 9
Virginia State Route 9
Virginia State Route 9 is a primary state highway in the U.S. state of Virginia. Known as Charles Town Pike, the state highway runs from the West Virginia state line near Mechanicsville, where the highway continues west as West Virginia Route 9 , east to SR 7 and SR 7 Business near Paeonian...
Virginia State Route 28
Virginia State Route 28
State Route 28 is a primary state highway that traverses the counties of Loudoun, Fairfax, Prince William, and Fauquier in the U.S. state of Virginia. It is a major artery through Northern Virginia.-Loudoun County:...
Virginia State Route 267
Virginia State Route 267
State Route 267 is a primary state highway in the U.S. state of Virginia. It consists of two end-to-end toll roads – the Dulles Toll Road and Dulles Greenway – as well as the Dulles Access Road,...