Loudoun County is in the northern part of the Commonwealth of Virginia in the United States. In 2020, the census returned a population of 420,959, making it Virginia's third-most populous county. The county seat is Leesburg. Wikipedia

Cities: Leesburg, Ashburn, Sterling, Purcellville, Aldie, South Riding
Population: 432,085 (2022)
Mascot: Captains
Congressional district: 10th
Founded: 1757
Largest town: Leesburg
Named for: John Campbell, 4th Earl of Loudoun