Sullivan County is Tennessee’s second-oldest county and home to Kingsport, part of Bristol, part of Johnson City and areas in between. Sullivan County also hosts the second-largest cave in Tennessee, along with several lakes, rivers, and rolling hills. Sullivan County contains both metropolitan areas and mountainous terrain. The locally names Last Colosseum, more commonly known as the Bristol Motor Speedway, also calls Sullivan County home. Come enjoy the Tri-Cities regional area with a visit to Sullivan County.