Ashburn is a census-designated place (CDP) in Loudoun County, Virginia. As of the 2010 United States Census, its population was 43,511. It is 30 miles (48 km) northwest of Washington, D.C. and part of the Washington metropolitan area.
A significant portion of the world's Internet traffic passes through Ashburn.
Ashburn was originally called Farmwell (variant names include Old Farmwell and Farmwell Station) after a nearby mansion of that name owned by George Lee III. The name "Farmwell" first appeared in George Lee's October 1802 will and was used to describe the 1,236-acre (500 ha) plantation he inherited from his father, Thomas Ludwell Lee II. A section of Farmwell plantation west of Ashburn Road, a 580-acre (230 ha) tract, was purchased in 1841 as a summer home by John Janney, a Quaker lawyer who nearly became Vice President of the United States. Janney called the property Ashburn Farm; the name's first known appearance in writing is 1870 when he sold the property. It is likely he named the farm after family friends whose name was "Ashburn".
The Belmont Manor House and Janelia are listed on the National Register of Historic Places.
Ashburn is located at 39°02′37″N 077°29′15″W (39.0437192, −77.4874899) and its average elevation is 295 feet (90 m) above sea level. According to the 2010 United States Census, the CDP has a total area of 17.287 square miles (44.77 km2), of which 17.025 square miles (44.09 km2) is land and 0.262 square miles (0.68 km2) is water. Ashburn is located between Washington Dulles International Airport and Leesburg, the county seat of Loudoun County.
The Ashburn area consists of many major and minor subdivisions such as Ashbrook, Ashburn Farm, Ashburn Village, the Courts and Ridges at Ashburn, Belmont Greene, Belmont Country Club, Brambleton, Broadlands, Goose Creek Village North and South, and the Village of Waxpool.
The United States Census Bureau defines Ashburn as a census-designated place (CDP).