Jefferson County is a county located in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 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...

. As of 2010, the population was 53,498. Its county seat

County seat

A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

 is Charles Town

Charles Town, West Virginia

Charles Town is a city in and the county seat of Jefferson County, West Virginia, United States. The population was 2,907 at the 2000 census. Due to its similar name, travelers have sometimes confused this city with the state's capital, Charleston.-History:...

. Jefferson County is part of the Washington Metropolitan Area

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...

.
Jefferson County was formed from Berkeley County

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...

 in 1801 and named for Thomas Jefferson

Thomas Jefferson

Thomas Jefferson was the principal author of the United States Declaration of Independence and the Statute of Virginia for Religious Freedom , the third President of the United States and founder of the University of Virginia...

, author of the Declaration of Independence

Declaration of independence

A declaration of independence is an assertion of the independence of an aspiring state or states. Such places are usually declared from part or all of the territory of another nation or failed nation, or are breakaway territories from within the larger state...

 and third President of the United States

President of the United States

The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

. Virginia previously had a Jefferson County, which was lost to form the new state of Kentucky. Accordingly, in the State records of Virginia, there will be listings for Jefferson County from 1780-1792 and Jefferson County from 1801-1863.