Colonial Heights is a census-designated place in Sullivan County, Tennessee, United States. It is located within the city of Kingsport. The population was 3,055 at the 2020 census down from 6,934 at the 2010 census, due to annexation by the city of Kingsport. It is part of the Kingsport-Bristol-Bristol, TN-VA Metropolitan Statistical Area, which is a component of the Johnson City-Kingsport-Bristol, TN-VA Combined Statistical Area, commonly known as the "Tri-Cities" region.