Kingsport is a city in Sullivan and Hawkins counties in the U.S. state of Tennessee. As of the 2020 census, its population was 55,442. Lying along the Holston River, Kingsport is commonly included in what is known as the Mountain Empire, which spans a portion of southwest Virginia and the mountainous counties in northeastern Tennessee. It is the largest city in the Kingsport–Bristol metropolitan area, which had a population of 307,614 in 2020. The metro area is a component of the larger Tri-Cities region of Tennessee and Virginia, with a population of 508,260 in 2020.

Sullivan County is a county located in the U.S. state of Tennessee on its northeast border. As of the 2020 census, the population was 158,163. Its county seat is Blountville.