Founded in 1779, Sullivan County is one of 95 counties in the state of Tennessee. Historically, Sullivan County was formed from Washington County. The city of Blountville is the county seat. With FIPS code of 163, Sullivan County has a population of 159,265 and area of 413 square miles (1,070 km2).
List of all cities in Sullivan County, TN alphabetically
| City/Town | Postal Code | Area Code |
| Bloomingdale, TN | 37660 | 423 |
| Blountville, TN | 37617 | 423 |
| Bluff City, TN | 37618 | 423 |
| Bristol, TN | 37620 | 423 |
| 37621 | 423 | |
| 37625 | 423 | |
| Colonial Heights, TN | 37663 | 423 |
| Home Shopping Network, TN | 37699 | 423 |
| Kingsport, TN | 37660 | 423 |
| 37662 | 423 | |
| 37663 | 423 | |
| 37664 | 423 | |
| 37665 | 423 | |
| 37669 | 423 | |
| Kingsport General, TN | 37669 | 423 |
| Piney Flats, TN | 37686 | 423 |
| 37699 | 423 |