Campbell County is a county in the U.S. state of Tennessee. It is located on the state's northern border in East Tennessee. As of the 2020 census, its population was 39,272. Its county seat is Jacksboro. Campbell County is included in the Knoxville metropolitan statistical area.

Jacksboro is a town in Campbell County, Tennessee, United States. The population was 2,306 at the 2020 census. It is the county seat of Campbell County.