21917 -- U.S. ZIP code Municipality (1990): COLORA, Maryland All ZIPs for this municipality (1990): 21917 Population (2000): 2005 Housing Units (2000): 702 Land area (2000): 7.425795 sq. miles (19.232720 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 7.425795 sq. miles (19.232720 sq. km) Located within: Maryland (MD) Location: 39.671671 N, 76.097205 W