Annandale is an unincorporated place in Fairfax County, Virginia, United States. Recognized by the U.S. Census Bureau as a census-designated place, the community had a total population of 54,994 as of the 2000 census. Annandale apartments for rent comparison page shows most up to date rent information on Annandale apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.