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Loudoun County
Also known as Loudoun County, Virginia, Loudoun County, VA
county in Virginia, United States
Key facts
- Country
- United States
- State
- Virginia
- Named after
- John Campbell, 4th Earl of Loudoun
- Seat
- Leesburg
- Largest town
- Leesburg
- Total
- 521.33 sq mi (1,350.2 km )
- Land
- 515.74 sq mi (1,335.8 km )
- Water
- 5.6 sq mi (15 km ) 1.1%
- Estimate 2025
- 449,749
- Density
- 810/sq mi (310/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional district
~29 min read
Article
Loudoun County (/ˈlaʊdən/) 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. Loudoun County is part of the Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Statistical Area.
As of 2023, Loudoun County had a median household income of $156,821, the highest of any county or county equivalent in the nation.
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1750s establishments in the Colony of Virginia1757 establishments in the Thirteen ColoniesCounties and county equivalents of the Washington metropolitan areaLoudoun County, VirginiaNorthern Virginia countiesStates and territories established in 1757Virginia countiesVirginia counties on the Potomac River