Iron -- U.S. County in Missouri Population (2000): 10697 Housing Units (2000): 4907 Land area (2000): 551.339034 sq. miles (1427.961482 sq. km) Water area (2000): 0.713741 sq. miles (1.848581 sq. km) Total area (2000): 552.052775 sq. miles (1429.810063 sq. km) Located within: Missouri (MO), FIPS 29 Location: 37.539303 N, 90.743905 W Headwords: Iron Iron, MO Iron County Iron County, MO