Duncombe, IA -- U.S. city in Iowa Population (2000): 474 Housing Units (2000): 196 Land area (2000): 1.967048 sq. miles (5.094630 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.967048 sq. miles (5.094630 sq. km) FIPS code: 22755 Located within: Iowa (IA), FIPS 19 Location: 42.469886 N, 93.992806 W ZIP Codes (1990): 50532 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Duncombe, IA Duncombe