Chantilly is a census-designated place in western Fairfax County, Virginia, United States. The population was 23,039 at the 2010 census. Chantilly is named after an early-19th-century mansion and farm, which in turn took the name of an 18th-century plantation that was located in Westmoreland County, Virginia. The name "Chantilly" originated in France with the Château de Chantilly, about 25 miles north of Paris. Located in the Northern Virginia portion of the Washington metropolitan area, Chantilly sits approximately 25 miles (40 km) west of Washington, D.C., via Interstate 66 and U.S. Route 50. It is located between Centreville to the south, Herndon and Reston to the north and northeast, respectively, and Fairfax 7 miles (11 km) to the southeast. U.S. Route 50 and Virginia State Route 28 intersect in Chantilly, and these highways provide access to the Dulles/Reston/Tysons Corner technology corridor and other major employment centers in Northern Virginia and Washington, D.C.
For the period 2010 through 2014, the estimated median annual income for a household in the CDP was $118,991, and the median income for a family was $130,280. Male full-time workers had a median income of $81,596 versus $62,228 for females. The per capita income for the CDP was $46,341. The American Registry for Internet Numbers is headquartered adjacent to Washington Dulles International Airport, near Chantilly. At one time, Compass Airlines was headquartered near Chantilly. The headquarters was relocated to Minnesota in late 2009.
Residents of the CDP go to Fairfax County Public Schools. Elementary schools within the CDP include Brookfield Elementary School, Greenbriar East Elementary School, Greenbriar West Elementary School, Lees Corner Elementary School, Navy Elementary School, and Poplar Tree Elementary School. Fairfax County Public Library operates the Chantilly Regional Library in the CDP.