Oakton is a census-designated place (CDP) in Fairfax County, Virginia, United States. The 2010 Census cites 34,166 residents. Oakton is an affluent community in Northern Virginia. Its center is 15 miles (24 km) southwest of Washington, D.C. Oakton is located at 38°52′59″N 77°17′24″W (38.883050, -77.289900). The area is traversed by I-66 andVirginia State Route 123.According to the United States Census Bureau, the CDP has a landmass of 9.7 square miles (25.1 km²).