Castalia, IA -- U.S. city in Iowa Population (2000): 175 Housing Units (2000): 81 Land area (2000): 0.720082 sq. miles (1.865005 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.720082 sq. miles (1.865005 sq. km) FIPS code: 11485 Located within: Iowa (IA), FIPS 19 Location: 43.112261 N, 91.677256 W ZIP Codes (1990): 52133 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Castalia, IA Castalia