Sullivan County, Tennessee

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Sullivan County is a county located in the U.S. state of Tennessee. As of 2010, the population was 256,678. Its county seat is Blountville.[1]

Sullivan County is part of the KingsportBristol (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.



According to the U.S. Census Bureau, the county has a total area of 430 square miles (1,113 km²), of which 413 square miles (1,070 km²) is land and 17 square miles (43 km²) (3.88%) is water. Sullivan County's boundary with Carter County and Johnson County is defined as the ridgeline of Holston Mountain.

Adjacent counties

Protected areas

Morrill Cave

Morrill Cave (also known as Worleys Cave) is a Tennessee State Natural Area. The cave has a surveyed length of 4.4 miles, making it the second longest cave in East Tennessee and number 177 on the USA Long Cave List.[2][3] Morrill Cave is located on the south side of the Holston River, 2 1/2 miles east of Bluff City. This cave was a major saltpeter mine during the Civil War, saltpeter being the main ingredient of gunpowder. Significant evidence of this mining activity remains in the cave, including evidence of large amounts of saltpeter-bearing dirt that were removed, pick marks in the dirt, and an elaborate system of trails used by the miners.[4]

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