21028 -- U.S. ZIP code Municipality (1990): CHURCHVILLE, Maryland All ZIPs for this municipality (1990): 21028 Population (2000): 2742 Housing Units (2000): 1042 Land area (2000): 12.581704 sq. miles (32.586463 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 12.581704 sq. miles (32.586463 sq. km) Located within: Maryland (MD) Location: 39.559374 N, 76.247579 W