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Colonial Heights is a census-designated place (CDP) in Sullivan County, Tennessee, United States. The population was 6,934 at the 2010 census. It is part of the Kingsport–Bristol (TN)–Bristol (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.
Colonial Heights is located at 36°28′40″N 82°30′19″W (36.477769, -82.505278).
According to the United States Census Bureau, the CDP has a total area of 6.2 square miles (16 km2), of which, 6.0 square miles (16 km2) of it is land and 0.3 square miles (0.78 km2) of it (4.15%) is water.
As of the census of 2000, there were 7,067 people, 2,811 households, and 2,217 families residing in the CDP. The population density was 1,086.5 people per square mile (419.8/km2). There were 2,936 housing units at an average density of 451.4/sq mi (174.4/km2). The racial makeup of the CDP was 97.59% White, 0.88% African American, 0.16% Native American, 0.67% Asian, 0.03% Pacific Islander, 0.20% from other races, and 0.48% from two or more races. Hispanic or Latino of any race were 0.72% of the population.
There were 2,811 households, out of which 31.5% had children under the age of 18 living with them, 68.9% were married couples living together, 7.6% had a female householder with no husband present, and 21.1% were non-families. 18.7% of all households were made up of individuals, and 7.2% had someone living alone who was 65 years of age or older.