Algona, IA -- U.S. city in Iowa Population (2000): 5741 Housing Units (2000): 2640 Land area (2000): 4.487375 sq. miles (11.622247 sq. km) Water area (2000): 0.017458 sq. miles (0.045217 sq. km) Total area (2000): 4.504833 sq. miles (11.667464 sq. km) FIPS code: 01135 Located within: Iowa (IA), FIPS 19 Location: 43.070274 N, 94.229726 W ZIP Codes (1990): 50511 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Algona, IA Algona