Allen -- U.S. County in Kentucky Population (2000): 17800 Housing Units (2000): 8057 Land area (2000): 346.121650 sq. miles (896.450919 sq. km) Water area (2000): 5.919200 sq. miles (15.330656 sq. km) Total area (2000): 352.040850 sq. miles (911.781575 sq. km) Located within: Kentucky (KY), FIPS 21 Location: 36.748478 N, 86.183210 W Headwords: Allen Allen, KY Allen County Allen County, KY