The state of Tennessee, USA is currently served by a total of 7 area codes:
These Tennessee area codes overlay (cover the same geographic area). The first code listed is the parent code. Overlay area codes are added when no more phone numbers are available in an existing Numbering Plan Area.
| City | County | Area Codes |
|---|---|---|
| Bartlett | Shelby | 901 |
| Brentwood | Williamson | 615, 629 |
| Chattanooga | Hamilton | 423 |
| Clarksville | Montgomery | 931 |
| Cleveland | Bradley | 423 |
| Collierville | Shelby | 901 |
| Columbia | Maury | 931 |
| Cookeville | Putnam | 931 |
| Franklin | Williamson | 615, 629 |
| Gallatin | Sumner | 615, 629 |
| Germantown | Shelby | 901 |
| Hendersonville | Sumner | 615, 629 |
| Jackson | Madison | 731 |
| Johnson City | Washington | 423 |
| Kingsport | Sullivan | 423 |
| Knoxville | Knox | 865 |
| La Vergne | Rutherford | 615, 629 |
| Lebanon | Wilson | 615, 629 |
| Memphis | Shelby | 901 |
| Morristown | Hamblen | 423 |
| Mount Juliet | Wilson | 615, 629 |
| Murfreesboro | Rutherford | 615, 629 |
| Nashville | Davidson | 615, 629 |
| Smyrna | Rutherford | 615, 629 |
| Spring Hill | Maury | 931 |