21678 -- U.S. ZIP code Municipality (1990): WORTON, Maryland All ZIPs for this municipality (1990): 21678 Population (2000): 2265 Housing Units (2000): 1014 Land area (2000): 40.744951 sq. miles (105.528935 sq. km) Water area (2000): 0.190364 sq. miles (0.493041 sq. km) Total area (2000): 40.935315 sq. miles (106.021976 sq. km) Located within: Maryland (MD) Location: 39.295736 N, 76.099740 W