Oakton is a place 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.
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.