Griswold, IA -- U.S. city in Iowa Population (2000): 1039 Housing Units (2000): 491 Land area (2000): 0.614426 sq. miles (1.591355 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.614426 sq. miles (1.591355 sq. km) FIPS code: 33150 Located within: Iowa (IA), FIPS 19 Location: 41.235392 N, 95.140624 W ZIP Codes (1990): 51535 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Griswold, IA Griswold