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Oakton is a census-designated place (CDP) in Fairfax County, Virginia, in the United States. The population was 29,348 at the 2000 census. The ZIP code is 22124.
Oakton is located at 38°52′59″N 77°17′24″W / 38.88306°N 77.29°W / 38.88306; -77.29 (38.883050, -77.289900). The area is traversed by I-66 and Virginia State Route 123.
According to the United States Census Bureau, the CDP has a total area of 9.7 square miles (25.1 km²), all of it land.