25420 -- U.S. ZIP code Municipality (1990): GERRARDSTOWN, West Virginia All ZIPs for this municipality (1990): 25420 Population (2000): 3565 Housing Units (2000): 1424 Land area (2000): 29.828529 sq. miles (77.255533 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 29.828529 sq. miles (77.255533 sq. km) Located within: West Virginia (WV) Location: 39.379281 N, 78.122295 W