Leesburg is a town in the state of Virginia, and the county seat of Loudoun County. Settlement in the area began around 1740, which is named for the Lee family, early leaders of the town. Located in t…Leesburg is a town in the state of Virginia, and the county seat of Loudoun County. Settlement in the area began around 1740, which is named for the Lee family, early 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, DC, and in the Civil War, it changed hands several times.