Madison -- U.S. County in Iowa Population (2000): 14019 Housing Units (2000): 5661 Land area (2000): 561.135893 sq. miles (1453.335230 sq. km) Water area (2000): 1.160117 sq. miles (3.004689 sq. km) Total area (2000): 562.296010 sq. miles (1456.339919 sq. km) Located within: Iowa (IA), FIPS 19 Location: 41.336910 N, 94.017570 W Headwords: Madison Madison, IA Madison County Madison County, IA