Hayfield is a census-designated place in Fairfax County, Virginia, United States. The population as of the 2010 census was 3,909. It is located in southeastern Fairfax County, bordered by Kingstowne to the northwest, Rose Hill to the north, Groveton to the east, and Fort Belvoir to the south. The main road through Hayfield is Telegraph Road, which leads northeast 5 miles into Alexandria and southwest 4 miles to U.S. Route 1 at Pohick. According to the U.S. Census Bureau, Hayfield has a total area of 1.4 square miles, 1.3 square miles of which is land and 0.1 square miles, or 8.14%, of which is water.