Phone numbers in Decatur, Tennessee
Decatur has 4 phone prefixes in area code 423.
Biggest holders: AT&T (local phone), Level 3 (Lumen), Bandwidth. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 25%
- Internet / business phone carrier 75%
Every prefix in Decatur
Search the first six digits of a number in this list. If it's here, the number started in Decatur with the carrier shown. If it isn't, check the Tennessee page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 423-334 | AT&T (local phone) | Local phone company | – |
| 423-454 | Level 3 (Lumen) | Internet / business phone carrier | 2004 |
| 423-565 | Bandwidth | Internet / business phone carrier | 2018 |
| 423-864 | Onvoy | Internet / business phone carrier | 2023 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.