Madison -- U.S. County in Florida Population (2000): 18733 Housing Units (2000): 7836 Land area (2000): 691.794930 sq. miles (1791.740566 sq. km) Water area (2000): 24.004687 sq. miles (62.171851 sq. km) Total area (2000): 715.799617 sq. miles (1853.912417 sq. km) Located within: Florida (FL), FIPS 12 Location: 30.443902 N, 83.425800 W Headwords: Madison Madison, FL Madison County Madison County, FL