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Chantilly is a census-designated place in western Fairfax County, Virginia, in the Washington metropolitan area, about 25 miles west of Washington, D.C., via Interstate 66 and U.S. Route 50.

Chantilly had a population of 24,301 in the 2020 census, up from 23,039 in 2010, spread over about 12.2 square miles.

Chantilly is named after the Chantilly Plantation built in the early 1800s by Charles Calvert Stuart and his wife Cornelia, which itself took the name of a Westmoreland County plantation owned by her grandfather Richard Henry Lee, a signer of the Declaration of Independence.

Chantilly was home to a number of colonial plantations in the 1700s, including the Sully Plantation built by Richard Bland Lee I, now preserved as the Sully Historic Site, and Leeton Grove, whose main house still stands on Walney Road.

Federal troops burned the Chantilly Plantation manor house during the Civil War, and its Stone House is the only building of the former plantation that still exists.

The Battle of Chantilly, also called the Battle of Ox Hill, was fought on September 1, 1862, at the close of the Northern Virginia Campaign, and Union generals Isaac Stevens and Philip Kearny were both killed in the fighting.

Only about 4.8 acres of the Chantilly battlefield survive today as Ox Hill Battlefield Park on West Ox Road, with monuments to Generals Stevens and Kearny erected in 1915.

Chantilly's biggest attraction is the Steven F. Udvar-Hazy Center, the Smithsonian National Air and Space Museum's annex near Washington Dulles International Airport, which opened in 2003 to display aircraft and spacecraft too large for the museum on the National Mall, including an SR-71.

U.S. Route 50 and State Route 28 intersect in Chantilly, giving it direct access to the Dulles, Reston, and Tysons technology corridor, and Washington Dulles International Airport borders the CDP to the north.

Chantilly students attend Fairfax County Public Schools, including Chantilly High School and Westfield High School, the home of the Bulldogs.