West Falls Church is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 29,207 at the 2010 census. Before 2010, West Falls Church was officially named Jefferson. Outside of the Jefferson Village neighborhood, "Jefferson" generally is not used locally to refer to the area bounding Falls Church city to the south and southwest that comprises the CDP. Likewise, "West Falls Church" is rarely used to describe the area but is usually applied to areas west of Falls Church city or near West Falls Church Metro station. The bulk of it is made of subdivisions built in the 1940s and early 1950s, including Jefferson Village, Westlawn, Hillwood, Sleepy Hollow, Woodley, Raymondale and Broyhill Park. Homes and businesses have Falls Church mailing addresses (mainly ZIP Code 22042).