Fort Hunt is a census-designated place (CDP) in Fairfax County, Virginia, United States. It is one of the wealthiest places in the United States, and is most famous for the site of former P.O. Box 1142, a military interrogation center during World War II. It is also notable for its high population of senior citizens and for being one of the first suburbs in wealthy Fairfax County. Nearby CDPs include Mount Vernon, Virginia (southwest), Belle Haven, Virginia (north) and Hybla Valley, Virginia (west).