Kingston is a city in and the county seat of Roane County, Tennessee, United States. This city is thirty-six miles southwest of Knoxville. It ha…Kingston is a city in and the county seat of Roane County, Tennessee, United States. This city is thirty-six miles southwest of Knoxville. It had a population of 5,934 at the 2010 United States census, and is included in the Harriman, Tennessee Micropolitan Statistical Area. Kingston is adjacent to Watts Bar Lake.