Hartwick, IA -- U.S. city in Iowa Population (2000): 83 Housing Units (2000): 40 Land area (2000): 0.129550 sq. miles (0.335533 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.129550 sq. miles (0.335533 sq. km) FIPS code: 34770 Located within: Iowa (IA), FIPS 19 Location: 41.785264 N, 92.344290 W ZIP Codes (1990): 52232 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Hartwick, IA Hartwick