Blountville is a census-designated place (CDP) located in Sullivan County, Tennessee, in the United States. It serves as the county seat for Sullivan County and has a population that grew from 3,074 in the 2010 census to 3,120 in the 2020 census.
The location is notable for its unique administrative status within the state. Blountville is the only county seat in Tennessee that is not an incorporated city or town.