Loudon -- U.S. County in Tennessee Population (2000): 39086 Housing Units (2000): 17277 Land area (2000): 228.881674 sq. miles (592.800788 sq. km) Water area (2000): 18.429200 sq. miles (47.731408 sq. km) Total area (2000): 247.310874 sq. miles (640.532196 sq. km) Located within: Tennessee (TN), FIPS 47 Location: 35.744899 N, 84.295510 W Headwords: Loudon Loudon, TN Loudon County Loudon County, TN