Ashburn is an unincorporated settlement and census-designated place (CDP) in Loudoun County, Virginia, United States. At the 2020 United States census, its population was 46,349, up from 3,393 in 1990. It is 30 miles (48 km) northwest of Washington, D.C., and part of the Washington metropolitan area. Ashburn is a major hub for Internet traffic due to its many data centers.