Irwin, IA -- U.S. city in Iowa Population (2000): 372 Housing Units (2000): 180 Land area (2000): 0.595739 sq. miles (1.542956 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.595739 sq. miles (1.542956 sq. km) FIPS code: 39000 Located within: Iowa (IA), FIPS 19 Location: 41.790449 N, 95.207341 W ZIP Codes (1990): 51446 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Irwin, IA Irwin