Sullivan County was created in 1779 from a portion of Washington County, and named for John Sullivan, a Patriot … See more

According to the U.S. Census Bureau, the county has a total area of 430 square miles (1,100 km ), of which 413 square miles (1,070 km ) is land and 16 square miles (41 km ) (3.8%) is water. The western portion of the county l… See more

As of the 2020 United States census, there were 158,163 people, 68,560 households, and 44,284 families residing in the county.
As of the 2010 United States Census, there were 156,281 people living in the county. 95.5% were … See more

Sullivan County, like all of Tennessee outside Nashville and Memphis, is heavily Republican, but, unlike most of East Tennessee, has not voted consistently Republican since the Civil War. Being one of only six … See more

• Bluff City
• Bristol
• Johnson City (mostly in Washington County and a small portion in Carter County)
• Kingsport (partial)… See more