Ashburn is a rapidly growing census-designated place (CDP) in Loudoun County, Virginia, United States.

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.

[7] The Ashburn Presbyterian Church, the Belmont Manor House, the Broad Run Bridge and Tollhouse, and Janelia Farm are listed on the National Register of Historic Places.

Ashburn is located in eastern Loudoun County at 39°02′37″N 077°29′15″W / 39.04361°N 77.48750°W / 39.04361; -77.48750 (39.0437192, −77.4874899) and its average elevation is 295 feet (90 m) above sea level.

[1] It is 7 miles (11 km) southeast of Leesburg, the county seat, and the same distance north of Dulles International Airport.

[2] The area is drained by Broad Run, which flows northward through the eastern part of the CDP toward the Potomac River.

[10] Many of its residents commute into Washington, D.C. and the surrounding suburbs such as Tysons Corner and Reston to their places of employment.

[15] Verizon Business has a major office in Ashburn at the location replacing MCI WorldCom's headquarters after its acquisition.

[18] Ashburn is a major hub for data centers, with companies such as Digital Realty,[19] Equinix,[20] and NTT,[21] operating multiple facilities there.

INOVA Sports Performance Center, the training camp for the Washington Commanders of the National Football League, is located in the east part of Ashburn.

[27][28] Airbus Group, Inc., a defense contractor headed by former NASA administrator Sean O'Keefe, has a second location in Ashburn in addition to its main office in Herndon, Virginia.

In December 2009, it was announced that George Mason University was planning to set up a campus in Ashburn, to be located at Exit 6 off the Dulles Greenway.