Loudoun County, Virginia
Loudoun County, Virginia | |
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Loudoun County Courthouse and a World War II monument (right) in Leesburg, February 2021 | |
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Flag Seal Logo | |
| Motto: "I Byde My Time" | |
Location within the U.S. state of Virginia | |
| Coordinates: 39°05′N 77°38′W / 39.09°N 77.64°W | |
| Country | United States |
| State | Virginia |
| Founded | 1757 |
| Named after | John Campbell, 4th Earl of Loudoun |
| Seat | Leesburg |
| Largest town | Leesburg |
| Area | |
• Total | 521.33 sq mi (1,350.2 km2) |
| • Land | 515.74 sq mi (1,335.8 km2) |
| • Water | 5.6 sq mi (15 km2) 1.1% |
| Population (2020) | |
• Total | 420,959 |
| • Density | 810/sq mi (310/km2) |
| Time zone | UTC−5 (Eastern) |
| • Summer (DST) | UTC−4 (EDT) |
| Congressional district | 10th |
| Website | loudoun.gov |
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.