St. Marys, IA -- U.S. city in Iowa Population (2000): 134 Housing Units (2000): 49 Land area (2000): 0.138381 sq. miles (0.358405 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.138381 sq. miles (0.358405 sq. km) FIPS code: 70095 Located within: Iowa (IA), FIPS 19 Location: 41.307271 N, 93.736082 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Marys, IA St. Marys