| 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 |
|---|---|---|---|
| 423-351 | Sweetwater | Monroe | Landline |
| 423-576 | - | - | - |
| 423-328 | Johnson City | Washington | Landline |
| 423-622 | Chattanooga | Hamilton | Landline |
| 423-319 | Huntsville | Scott | Landline |
| 423-465 | Newport | Cocke | Wireless |
| 423-499 | Chattanooga | Hamilton | Landline |
| 423-892 | Chattanooga | Hamilton | Landline |
| 423-236 | Apison | Hamilton | Landline |
| 423-391 | Bluff City | Sullivan | Landline |
| 423-408 | Kingsport | Sullivan | Landline |
| 423-712 | Johnson City | Washington | Landline |
| 423-541 | Madisonville | Monroe | Landline |
| 423-360 | Johnson City | Washington | Wireless |
| 423-212 | Blountville | Sullivan | Landline |
| 423-420 | Madisonville | Monroe | Landline |
| 423-702 | Chattanooga | Hamilton | Landline |
| 423-599 | Cleveland | Bradley | Wireless |
| 423-431 | Johnson City | Washington | Landline |
| 423-782 | Kingsport | Sullivan | Landline |