what county is lorton virginia in?
Sponsored Topics. Lorton is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population is 27,709 as of the 2008 census estimate. Lorton is named for a village in the Lake District National Park, Cumbria in England, the hometown of Joseph Plaskett who settled in the area running a general store and opened the Lorton Valley, Virginia Post Office on November 11, 1875.