Colby, KS -- U.S. city in Kansas Population (2000): 5450 Housing Units (2000): 2405 Land area (2000): 3.337786 sq. miles (8.644826 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.337786 sq. miles (8.644826 sq. km) FIPS code: 14650 Located within: Kansas (KS), FIPS 20 Location: 39.392093 N, 101.047532 W ZIP Codes (1990): 67701 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Colby, KS Colby