Fork Union is an unincorporated community in southern Fluvanna County, Virginia, along U.S. Highway 15. Its ZIP code is 23055; the population within that ZIP code was 1148 according to the 2000 Census. It is known mainly as the home of Fork Union Military Academy, Fork Union Animal Clinic and Fork Union Motor Lodge, and also for having one of the few surviving drive-in theatres in Virginia (1.5 miles south of town in an area known as Weber City).