Marble Rock, IA -- U.S. city in Iowa Population (2000): 326 Housing Units (2000): 157 Land area (2000): 0.835633 sq. miles (2.164279 sq. km) Water area (2000): 0.037470 sq. miles (0.097046 sq. km) Total area (2000): 0.873103 sq. miles (2.261325 sq. km) FIPS code: 49305 Located within: Iowa (IA), FIPS 19 Location: 42.964695 N, 92.867786 W ZIP Codes (1990): 50653 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Marble Rock, IA Marble Rock