Hardin -- U.S. County in Tennessee Population (2000): 25578 Housing Units (2000): 12807 Land area (2000): 577.861270 sq. miles (1496.653754 sq. km) Water area (2000): 18.450528 sq. miles (47.786645 sq. km) Total area (2000): 596.311798 sq. miles (1544.440399 sq. km) Located within: Tennessee (TN), FIPS 47 Location: 35.207362 N, 88.208172 W Headwords: Hardin Hardin, TN Hardin County Hardin County, TN