Copperhill is a city in Polk County, Tennessee, United States. The population was 443 at the 2020 census. It is included in the Clevelan…Copperhill is a city in Polk County, Tennessee, United States. The population was 443 at the 2020 census. It is included in the Cleveland Metropolitan Statistical Area. Copperhill is located in a geological region known as the Copper Basin, which was the site of a major copper mining operation between the 1840s and 1987.