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.
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Named for | General John Sullivan
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Founded | 1779
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Area:Total | 430 sq mi (1,100 km)
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Area:Land | 413 sq mi (1,070 km)
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Area:Water | 16 sq mi (40 km) 3.8%%
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Population:Estimate | 157,668
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Population:Density | 379/sq mi (146/km)
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