| General Information about Area Code 423 | |
|---|---|
| Country | United States |
| State / Province / Territory | Tennessee |
| Major City | Chattanooga |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 423-450 | Mosheim | Greene | Landline |
| 423-563 | Duff | Campbell | Landline |
| 423-488 | Chattanooga | Hamilton | Wireless |
| 423-547 | Elizabethton | Carter | Landline |
| 423-384 | Fall Branch | Washington | Wireless |
| 423-791 | Johnson City | Washington | Wireless |
| 423-569 | Oneida | Scott | Landline |
| 423-732 | Sullivan | Sullivan | - |
| 423-323 | Blountville | Sullivan | Landline |
| 423-837 | Jasper | Marion | Landline |
| 423-324 | Wartburg | Morgan | Landline |
| 423-610 | Johnson City | Washington | Landline |
| 423-490 | Chattanooga | Hamilton | Landline |
| 423-990 | Bristol | Sullivan | Landline |
| 423-510 | Chattanooga | Hamilton | Landline |
| 423-994 | Chattanooga | Hamilton | Wireless |
| 423-517 | Chattanooga | Hamilton | Landline |
| 423-463 | Chattanooga | Hamilton | Landline |
| 423-282 | Johnson City | Washington | Landline |
| 423-806 | Johnson City | Washington | Landline |