Oakton is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 34,166 at the 2010 census. Located in Northern Virginia, its center is 16 miles (26 km) west of Washington, D.C.
Oakton is located in central Fairfax County at 38°52′59″N 77°17′24″W (38.883050, −77.289900). The area is traversed by Interstate 66 and Virginia State Route 123.
The CDP is bordered to the south by the city of Fairfax, to the west by Fair Oaks, to the northwest by Difficult Run, to the north by the Wolf Trap CDP, to the east by the town of Vienna, and to the southeast by Merrifield.
According to the United States Census Bureau, the CDP has a total area of 9.8 square miles (25.4 km2), of which 9.8 square miles (25.3 km2) is land and 0.04 square miles (0.1 km2), or 0.38%, is water.
As of the census of 2000, there were 29,348 people, 11,118 households, and 7,649 families residing in the CDP. The population density was 3,024.1 people per square mile (1,168.2/km²). There were 11,392 housing units at an average density of 1,173.9/sq mi (453.5/km²). The racial makeup of the CDP was 74.46% White, 5.79% African American, 0.20% Native American, 13.83% Asian, 0.08% Pacific Islander, 3.08% from other races, and 3.56% from two or more races. Hispanic or Latino of any race were 9.65% of the population.
There were 11,118 households out of which 32.7% had children under the age of 18 living with them, 57.8% were married couples living together, 7.9% had a female householder with no husband present, and 31.2% were non-families.