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. Loudoun County's seat is Leesburg. 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. Since 2008, the county has been ranked first in the U.S. in median household income among jurisdictions with a population of 65,000 or more.
Herndon is a town in Fairfax County, Virginia, in the Washington, D.C. metropolitan area of the United States. In 2020, the population was estimated to be 24,532, which makes it the largest of three incorporated towns in the county.
Hamilton is a town in the Loudoun Valley of Loudoun County, Virginia, United States. The population was 506 as of the 2010 census.
Hillsboro is a rural town in Loudoun County, Virginia, United States. The population was 80 at the 2010 census and an estimated 169 as of 2019.
Leesburg is a town in and the county seat of Loudoun County, Virginia, United States. Settlement in the area began around 1740, which is named for the Lee family, early leaders of the town. Located in the far northeast of the state, in the War of 1812 it was a refuge for important federal documents evacuated from Washington, DC, and in the Civil War, it changed hands several times.
Lovettsville is a town in Loudoun County, located near the very northern tip of the Commonwealth of Virginia, United States. Settled primarily by German immigrants, the town was originally established in 1836.
Purcellville is a town in Loudoun County, Virginia. The population was 8,929 according to the 2020 Census. Purcellville is the major population center for Western Loudoun and the Loudoun Valley. Many of the older structures remaining in Purcellville reflect the Victorian architecture popular during the early twentieth century.
Round Hill is a town in Loudoun County, Virginia, United States. Its population was 539 at the 2010 census and an estimated 656 in 2019. The town is located at the crossroads of Virginia Routes 7 and 719, approximately 50 miles (80 km) northwest of Washington, D.C. The town's name refers a hill two miles northeast of a 910-foot (280 m) hill used during the American Civil War as a signal post by both Confederate and Union troops. House of Round Hill was built in 2004. Patsy Cline went to Round Hill Elementary School.
Sterling, Virginia, refers most specifically to a census-designated place (CDP) in Loudoun County, Virginia, United States. The population of the CDP as of the 2010 United States Census was 27,822. The CDP boundaries are confined to a relatively small area between Virginia State Route 28 on the west and Virginia State Route 7 on the northeast, excluding areas near SR 606 and the Dulles Town Center.
Ashburn is a census-designated place (CDP) in Loudoun County, Virginia, United States. At the 2010 United States Census, its population was 43,511, up from 3,393 twenty years earlier. It is 30 miles (48 km) northwest of Washington, D.C., and part of the Washington metropolitan area.
South Riding is a census-designated place and planned community in Loudoun County, Virginia, United States. The South Riding homeowner association was founded in January 1995 to provide services to the community. Neighboring U.S. Route 50 and State Route 28 provide access to the Dulles/Reston/Tysons Corner technology corridor and other major employment centers in Northern Virginia and Washington, D.C.
Aldie is an unincorporated community and census-designated place (CDP) located between Chantilly and Middleburg in Loudoun County, Virginia, United States. The historic village of Aldie is located on the John Mosby Highway in a gap between the Catoctin Mountains and Bull Run Mountains, through which the Little River flows. Aldie traditionally serves as the gateway to the Loudoun Valley and beyond.
Arcola is a census-designated place in Loudoun County, Virginia, United States. The population as of the 2010 United States Census was 233.
Belmont is a census-designated place (CDP) in Loudoun County, Virginia, United States. The population as of the 2010 United States Census was 5,966. It is 5 miles (8 km) southeast of Leesburg, the Loudoun county seat, and 31 miles (50 km) northwest of Washington, D.C. The Belmont Manor House, built between 1799 and 1802 by a son of Richard Henry Lee, is in the northeast part of the CDP and is now the clubhouse for a gated golf community.
Dulles Town Center is a census-designated place (CDP) in Loudoun County, Virginia, United States. It is located about 7 miles (11 km) north of Washington Dulles International Airport. The CDP is the location of the Dulles Town Center shopping mall, for which it is named. The United States Postal Service considers Dulles Town Center to be a subsection of Dulles, which is itself a subsection of Sterling; none of these locations is an incorporated municipality.
Lowes Island is a census-designated place (CDP) in Loudoun County, Virginia, United States. The population as of the 2010 United States Census was 10,756. Along with nearby Countryside and Cascades, it is considered one of the three main components of the Potomac Falls community.
Sugarland Run is a planned community and census-designated place in Loudoun County, Virginia, United States. The population at the 2010 census was 11,799. In 2020, it was estimated to be 12,956. Sugarland Run is part of the Washington metropolitan area and is 26 miles (42 km) by road northwest of Washington, D.C.
University Center is a census-designated place (CDP) in Loudoun County, Virginia, United States. The population as of the 2010 United States Census was 3,586. Mailing addresses in the community are for Ashburn.
McNair is a census-designated place located in the Oak Hill section of Fairfax County, Virginia, United States. It is directly to the east of Washington Dulles International Airport. The population as of the 2010 census was 17,513. Much of the population resides in the McNair Farms planned community. The community has a school called McNair Elementary.
United States 
Virginia 
Loudoun 
