21227 -- U.S. ZIP code Municipality (1990): HALETHORPE, Maryland All ZIPs for this municipality (1990): 21227 Population (2000): 33799 Housing Units (2000): 13519 Land area (2000): 11.247644 sq. miles (29.131264 sq. km) Water area (2000): 0.183558 sq. miles (0.475413 sq. km) Total area (2000): 11.431202 sq. miles (29.606677 sq. km) Located within: Maryland (MD) Location: 39.241957 N, 76.677124 W