Ottosen, IA -- U.S. city in Iowa Population (2000): 61 Housing Units (2000): 31 Land area (2000): 0.569604 sq. miles (1.475267 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.569604 sq. miles (1.475267 sq. km) FIPS code: 60420 Located within: Iowa (IA), FIPS 19 Location: 42.895609 N, 94.377878 W ZIP Codes (1990): 50570 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Ottosen, IA Ottosen