what county is kingsport tn
Homefacts City Report. Kingsport is located in Sullivan County, TN. The population is 51,206, making Kingsport the 2nd largest city in Sullivan County. There are 27 public schools in Kingsport with an average Homefacts rating of B+. The total crime rate for Kingsport is high, and there are 168 registered sex offenders residing in the city.