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The Voice of the

Commonwealth's Counties

Loudoun County

County Courthouse
County Details

County Seat: Leesburg

Year Organized: 1757

Total Square Miles: 516

2020 Population: 420,959

Persons/Square Mile: 816

County Structure

Government Type: County

Authority:  Dillon’s Rule

Legislative Body: Board of Supervisors

Size of Legislative Body: 9

County Links