Loudoun County , Virginia

Loudoun County: County in Virginia, United States

Loudoun County locator map
Location of Loudoun County on Virginia map.


Loudoun County is a county located in the U.S. state of Virginia. As of the 2010 census, the population was 312,311 and a population density of 231 people per km². After 9 years in 2019 county had an estimated population of 413,538 inhabitants. Its county seat is Leesburg. The county was created 264 years ago in 1756.


Loudoun County is located at 39°5'26"N 77°38'9"W (39.0906800, -77.6357200). It has 8 neighbors: Frederick County, Montgomery County, Washington County, Clarke County, Fairfax County, Fauquier County, Prince William County and Jefferson County.

Loudoun County Courthouse in Leesburg Virginia image
Loudoun County Courthouse in Leesburg Virginia

The largest city of Loudoun County is Ashburn with a population of 43,511. Other cities include, South Riding population 24,256, Broadlands population 12,313, Sugarland Run population 11,799 and Lowes Island population 10,756. See all Loudoun County cities & populated places.


Loudoun County forecast: Sunny, with a high near 81. Northwest wind 5 to 9 mph. more

Loudoun County Courthouse in Leesburg Virginia image

Loudoun County map

Loudoun County Quick Facts

Population : 413,538 (2019)
Country : United States of America
State : Virginia (United States)
Twitter username : loudouncogovt
Area : 1350 km2
Water as percent of area : 1.1%
Land as percent of area : 98.9%
Legislative body : Loudoun County Board of Supervisors
Named for : John Campbell, 4th Earl of Loudoun
Altitude : 715 feet / 218 meters
Capital : Leesburg
Establishment : January 01, 1757
Time Zone : America/New_York
Local time : 08:54:14 (2nd August 2021)
Density : 306 Pop. per km² as of 2019
Population growth : 24.48% (2010-2019)
Weather : 81℉ Sunny 7-days weather

Loudoun County has 8 neighbours.

  • Leesburg


The population of Loudoun County increased by 24.48% in 9 years.

Year Population % Change Method
2010 312,311 - census
2011 326,327 4.3% estimation process
2012 337,847 3.41% estimation process
2013 349,915 3.45% estimation process
2014 362,206 3.39% estimation process
2015 374,014 3.16% estimation process
2016 385,546 2.99% estimation process
2017 397,049 2.9% estimation process
2018 405,522 2.09% estimation process
2019 413,538 1.94% estimation process

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People born in Loudoun County (28)

People born in Loudoun County, including politician Alfred H. Powell, Union United States Army officer George Washington Emery Dorsey, politician Christopher Greenup, you can see a list of people who born in Loudoun County.

Loudoun County Populated Places (more)

Cities, Towns, Neighborhoods & Other Populated Places in Loudoun County.

City Name Population Title
Leesburg 53,727 Historic town within and the county seat of Loudoun County, Virginia, United States
Ashburn 43,511
Sterling 27,822 Census-designated place in Loudoun County, Virginia, US
South Riding 24,256
Broadlands 12,313
Sugarland Run 11,799
Lowes Island 10,756
Purcellville 10,178 Town in Virginia
Countryside 10,072
Brambleton 9,845
Belmont 5,966
Dulles Town Center 4,601
Loudoun Valley Estates 3,656
University Center 3,586
Lovettsville 2,198 Town of the United States
Oak Grove 1,777

Virginia Other Counties (more counties)

County Name Population Title
Virginia 8,535,519 State of the United States of America
Fairfax County 1,147,532 County in Virginia, United States
Prince William County 470,335 County in Virginia, United States
Virginia Beach 449,974 Independent city in Virginia, United States
Chesterfield County 352,802 County in South Carolina, United States
Henrico County 330,818 County in Virginia, United States
Chesapeake 244,835 Independent city in Virginia, United States
Norfolk 242,742 Independent city in Virginia, United States
Arlington County 236,842 County in Virginia, United States; suburb of Washington, D.
Richmond 230,436 Capital city of Virginia, United States
Arlington 229,164 County in Virginia, United States; suburb of Washington, D.
City of Portsmouth 215,133 Administrative division in Virginia, United States
Newport News 179,225 Independent city in Virginia, United States
Alexandria 159,428 Independent city in Virginia, United States
Stafford County 152,882 County in Virginia, United States
East Hampton 147,993 Town in New York

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