Oskaloosa, IA -- U.S. city in Iowa Population (2000): 10938 Housing Units (2000): 4945 Land area (2000): 6.862939 sq. miles (17.774930 sq. km) Water area (2000): 0.015063 sq. miles (0.039012 sq. km) Total area (2000): 6.878002 sq. miles (17.813942 sq. km) FIPS code: 59925 Located within: Iowa (IA), FIPS 19 Location: 41.293856 N, 92.644546 W ZIP Codes (1990): 52577 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Oskaloosa, IA Oskaloosa