Sullivan County, Tennessee, is located in the northeastern part of the state and is part of the Tri-Cities region, which includes Bristol, Johnson City, and Kingsport. The county was established in 1779 and is known for its rich history and natural beauty, including the Holston River and various parks. The county seat is Blountville, and it features a mix of urban and rural areas. Sullivan County is home to several educational institutions, including Northeast State Community College, and offers various recreational activities, making it a vibrant community for residents and visitors alike.