Jackson -- U.S. County in Illinois Population (2000): 59612 Housing Units (2000): 26844 Land area (2000): 588.124571 sq. miles (1523.235581 sq. km) Water area (2000): 14.402282 sq. miles (37.301738 sq. km) Total area (2000): 602.526853 sq. miles (1560.537319 sq. km) Located within: Illinois (IL), FIPS 17 Location: 37.769401 N, 89.314721 W Headwords: Jackson Jackson, IL Jackson County Jackson County, IL