Leesburg is a town in and the county seat of Loudoun County, Virginia, United States. It is part of both the Northern Virginia region of the state and the Washington metropolitan area, including Washington, D.C., the nation's capital.
European settlement in the area began around 1740, when it was named for the Lee family, early colonial leaders of the town. Located in the far northeast of the state, in the War of 1812 it was a refuge for important federal documents evacuated from Washington, D.C., and in the Civil War, it changed hands several times.