| District of Tennessee area codes: 423 | |
|---|---|
| Country | United States |
| State/Province | Tennessee |
| Major City | Chattanooga |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 423-200 | Hamblen | Morristown, TN | Level 3 Communications |
| 423-201 | Campbell | La Follette, TN | Level 3 Communications |
| 423-202 | Washington | Johnson City, TN | Brooks Fiber Communications Of Tennessee- Tn |
| 423-206 | Hamblen | Morristown, TN | Usa Mobility Wireless |
| 423-207 | Sullivan | Kingsport, TN | Level 3 Communications |
| 423-208 | Hamilton | Chattanooga, TN | New Cingular Wireless PCS - GA |
| 423-209 | Hamilton | Chattanooga, TN | Bellsouth Telecomm Inc DBA South Central Bell Tel |
| 423-210 | Monroe | Tellico Plains, TN | United States Cellular Corp. - Tennessee |
| 423-212 | Sullivan | Blountville, TN | Level 3 Communications |
| 423-213 | Washington | Johnson City, TN | Sprint Spectrum L.p. |
| 423-214 | Mcminn | Englewood, TN | United States Cellular Corp. - Tennessee |
| 423-215 | Scott | Oneida, TN | Cellco Partnership DBA Verizon Wireless |
| 423-216 | Polk | Benton, TN | Network Telephone Corporation |
| 423-217 | Sullivan | Bristol, TN | Level 3 Communications |
| 423-218 | Washington | Johnson City, TN | Level 3 Communications |
| 423-219 | Polk | Copperhill, TN | Network Telephone Corporation |
| 423-220 | Washington | Johnson City, TN | Us Lec Of Tennessee, Inc |
| 423-221 | Hamilton | Chattanooga, TN | Usa Mobility Wireless |
| 423-222 | Hamblen | Morristown, TN | Pagepro Corporation |
| 423-223 | Scott | Oneida, TN | New Cingular Wireless PCS - GA |
There are 610 prefixes, In the code area, the major cities are Bristol, TN;Chattanooga, TN;Cleveland, TN;East Rid. The major city is Chattanooga.