Kirwin, KS -- U.S. city in Kansas Population (2000): 229 Housing Units (2000): 151 Land area (2000): 0.948409 sq. miles (2.456369 sq. km) Water area (2000): 0.030727 sq. miles (0.079583 sq. km) Total area (2000): 0.979136 sq. miles (2.535952 sq. km) FIPS code: 37275 Located within: Kansas (KS), FIPS 20 Location: 39.672052 N, 99.121931 W ZIP Codes (1990): 67644 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Kirwin, KS Kirwin