Hays, KS -- U.S. city in Kansas Population (2000): 20013 Housing Units (2000): 8772 Land area (2000): 7.592616 sq. miles (19.664785 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 7.592616 sq. miles (19.664785 sq. km) FIPS code: 31100 Located within: Kansas (KS), FIPS 20 Location: 38.879399 N, 99.322277 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Hays, KS Hays