Coalfield is an unincorporated community and census-designated place (CDP) in Morgan County, Tennessee, United States. As of the 2010 census, the population of the CDP was 2,463, making Coalfield the most populous settlement in all of Morgan County. The community does have its own post office, with the ZIP code 37719.

Morgan County is a county located in the U.S. state of Tennessee. As of the 2020 census, the population was 21,035. Its county seat is Wartburg. Morgan County is part of the Knoxville, TN Combined Statistical Area.