Greenfield, IA -- U.S. city in Iowa Population (2000): 2129 Housing Units (2000): 999 Land area (2000): 1.815576 sq. miles (4.702319 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.815576 sq. miles (4.702319 sq. km) FIPS code: 32790 Located within: Iowa (IA), FIPS 19 Location: 41.305491 N, 94.458726 W ZIP Codes (1990): 50849 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Greenfield, IA Greenfield