Rose Hill is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 20,226 at the 2010 census. Built in the mid-1950s, Rose Hill is the largest of the subdivisions that make up the CDP, which is just southwest of Alexandria; others include Wilton Woods, Burgundy Village, and Winslow Heights. Street addresses are in Alexandria ZIP codes 22310, 22303 and 22315.