Chantilly is an unincorporated community located in western Fairfax County and southeastern Loudoun County of Northern Virginia. Recognized by the U.S. Census Bureau as a census designated place (CDP), the community population was 41,041 as of the 2000 census. It is named after the town of the same name in France.
Chantilly is home to Washington Dulles International Airport, which serves Washington, D.C. It is also the location of the Steven F. Udvar-Hazy Center annex of the National Air & Space Museum and the headquarters of the National Reconnaissance Office.
During September 1, Pope, apprised of Jackson's movement, began to withdraw toward Fairfax Court House. Late in the day, Jackson clashed with Union forces under Brigadier General Isaac Stevens and Major General Philip Kearny near Ox Hill, west of Fairfax. During the ensuing battle, which was fought amid a raging storm, both Union generals Stevens and Kearny were killed. The fighting ended at dusk, and Pope's army continued its withdrawal to Fairfax and subsequently to the Washington defenses.
Although commercial and residential development now covers most of the Chantilly (Ox Hill) battlefield, a small county park preserves a five acre (19,000 m²) portion of the battle site.
Informally, Chantilly is located around the intersection of US-50 (Lee Jackson Memorial Hwy) and VA-28 (Sully Rd).
Chantilly has some land area that is located in Loudoun County, Virginia.
There were 14,840 households out of which 38.1% had children under the age of 18 living with them, 60.6% were married couples living together, 7.4% had a female householder with no husband present, and 29.1% were non-families. 20.2% of all households were made up of individuals and 2.1% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.24.
In the CDP the population was spread out with 26.1% under the age of 18, 7.8% from 18 to 24, 38.4% from 25 to 44, 23.0% from 45 to 64, and 4.8% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 98.4 males. For every 100 females age 18 and over, there were 96.1 males.
The median income for a household in the CDP was $87,991, and the median income for a family was $98,202. Males had a median income of $61,954 versus $41,608 for females. The per capita income for the CDP was $36,200. About 1.3% of families and 2.3% of the population were below the poverty line, including 1.7% of those under age 18 and 5.5% of those age 65 or over.
The area is seen by many as a "boom town" with more development planned for the future alongside ongoing construction throughout. Chantilly is home to many professionals including physicians that contract with the nearby airports and the government.
Loudoun County residents considered to be in Chantilly go to Loudoun County Public Schools.