Rockcastle -- U.S. County in Kentucky Population (2000): 16582 Housing Units (2000): 7353 Land area (2000): 317.525926 sq. miles (822.388337 sq. km) Water area (2000): 0.537546 sq. miles (1.392238 sq. km) Total area (2000): 318.063472 sq. miles (823.780575 sq. km) Located within: Kentucky (KY), FIPS 21 Location: 37.373922 N, 84.330624 W Headwords: Rockcastle Rockcastle, KY Rockcastle County Rockcastle County, KY