Loudoun County, Virginia

Loudoun County
County
Loudoun County Courthouse and a World War II monument (right) in Leesburg, February 2021
Flag Seal
Motto:  "I Byde My Time"[1]
Location within the U.S. state of Virginia
Virginia's location within the U.S.
Coordinates: 39°05′N 77°38′W / 39.09°N 77.64°W / 39.09; -77.64
Country	United States
State	Virginia
Founded	1757
Named for	John Campbell, 4th Earl of Loudoun[2]
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	www.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,^[3] making it Virginia's third-most populous county. The county seat is Leesburg.^[4] Loudoun County is part of the Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Statistical Area.

As of 2020, Loudoun County had a median household income of $147,111, the highest of any county in the nation.^[5]