Colby, WI -- U.S. city in Wisconsin Population (2000): 1616 Housing Units (2000): 645 Land area (2000): 1.482449 sq. miles (3.839525 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.482449 sq. miles (3.839525 sq. km) FIPS code: 16150 Located within: Wisconsin (WI), FIPS 55 Location: 44.910186 N, 90.317058 W ZIP Codes (1990): 54421 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Colby, WI Colby