Sullivan Gardens, TennesseeSullivan Gardens is a census-designated place in southwestern Sullivan County, Tennessee, located southwest of Kingsport.EducationSullivan Elementary School and Sullivan Middle School are located in the "downtown" area.TransportationTennessee State Route 93 used to run north and south through the community. Now most visitors continue on the Sullivan Gardens Parkway as a bypass as there is no major business located on Sullivan Gardens Drive. Tennessee State Route 347 runs east and west.