Decatur City, IA -- U.S. city in Iowa Population (2000): 199 Housing Units (2000): 103 Land area (2000): 0.391333 sq. miles (1.013548 sq. km) Water area (2000): 0.003053 sq. miles (0.007906 sq. km) Total area (2000): 0.394386 sq. miles (1.021454 sq. km) FIPS code: 19360 Located within: Iowa (IA), FIPS 19 Location: 40.742268 N, 93.832735 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Decatur City, IA Decatur City