The Merrimack Valley is a bi-state region along the Merrimack River

Merrimack River

The Merrimack River is a river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Atlantic Ocean at Newburyport...

 in the states of New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

 and Massachusetts

Massachusetts

The Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...

, United States. The Merrimack is one of the larger waterways in the New England

New England

New England is a region in the northeastern corner of the United States consisting of the six states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut...

 region and has helped define the livelihood and culture of those living along it since native times.

Major cities in the Merrimack Valley include Concord

Concord, New Hampshire

The city of Concord is the capital of the state of New Hampshire in the United States. It is also the county seat of Merrimack County. As of the 2010 census, its population was 42,695....

, Manchester

Manchester, New Hampshire

Manchester is the largest city in the U.S. state of New Hampshire, the tenth largest city in New England, and the largest city in northern New England, an area comprising the states of Maine, New Hampshire, and Vermont. It is in Hillsborough County along the banks of the Merrimack River, which...

 and Nashua

Nashua, New Hampshire

-Climate:-Demographics:As of the census of 2010, there were 86,494 people, 35,044 households, and 21,876 families residing in the city. The population density was 2,719.9 people per square mile . There were 37,168 housing units at an average density of 1,202.8 per square mile...

 in New Hampshire, as well as Lowell

Lowell, Massachusetts

Lowell is a city in Middlesex County, Massachusetts, USA. According to the 2010 census, the city's population was 106,519. It is the fourth largest city in the state. Lowell and Cambridge are the county seats of Middlesex County...

, Lawrence

Lawrence, Massachusetts

Lawrence is a city in Essex County, Massachusetts, United States on the Merrimack River. According to the 2010 U.S. Census, the city had a total population of 76,377. Surrounding communities include Methuen to the north, Andover to the southwest, and North Andover to the southeast. It and Salem are...

, Haverhill

Haverhill, Massachusetts

Haverhill is a city in Essex County, Massachusetts, United States. The population was 60,879 at the 2010 census.Located on the Merrimack River, it began as a farming community that would evolve into an important industrial center, beginning with sawmills and gristmills run by water power. In the...

 and Newburyport

Newburyport, Massachusetts

Newburyport is a small coastal city in Essex County, Massachusetts, United States, 35 miles northeast of Boston. The population was 21,189 at the 2000 census. A historic seaport with a vibrant tourism industry, Newburyport includes part of Plum Island...

 in Massachusetts.