21051 -- U.S. ZIP code Municipality (1990): FORK, Maryland All ZIPs for this municipality (1990): 21051 Population (2000): 70 Housing Units (2000): 29 Land area (2000): 0.045664 sq. miles (0.118269 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.045664 sq. miles (0.118269 sq. km) Located within: Maryland (MD) Location: 39.470440 N, 76.448987 W