Phone numbers in Kingsport, Tennessee
Kingsport has 32 phone prefixes in area code 423.
Biggest holders: CenturyLink / Lumen, MetroPCS (T-Mobile), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 38%
- Local phone company 44%
- Internet / business phone carrier 19%
Every prefix in Kingsport
Search the first six digits of a number in this list. If it's here, the number started in Kingsport with the carrier shown. If it isn't, check the Tennessee page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 423-224 | CenturyLink / Lumen | Local phone company | – |
| 423-229 | CenturyLink / Lumen | Local phone company | – |
| 423-230 | CenturyLink / Lumen | Local phone company | – |
| 423-245 | CenturyLink / Lumen | Local phone company | – |
| 423-246 | CenturyLink / Lumen | Local phone company | – |
| 423-247 | CenturyLink / Lumen | Local phone company | – |
| 423-251 | MetroPCS (T-Mobile) | Mobile carrier | 2017 |
| 423-276 | AT&T Mobility | Mobile carrier | – |
| 423-288 | CenturyLink / Lumen | Local phone company | – |
| 423-343 | CenturyLink / Lumen | Local phone company | – |
| 423-367 | AT&T Mobility | Mobile carrier | – |
| 423-378 | CenturyLink / Lumen | Local phone company | – |
| 423-390 | CenturyLink / Lumen | Local phone company | 2002 |
| 423-392 | CenturyLink / Lumen | Local phone company | – |
| 423-398 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 423-408 | Teleport Communications America | Internet / business phone carrier | 2009 |
| 423-429 | AT&T Mobility | Mobile carrier | 2008 |
| 423-480 | Verizon Wireless | Mobile carrier | 2012 |
| 423-530 | MetroPCS (T-Mobile) | Mobile carrier | 2012 |
| 423-578 | CenturyLink / Lumen | Local phone company | – |
| 423-579 | Mountainet Telephone | Local phone company | 2009 |
| 423-684 | Bandwidth | Internet / business phone carrier | 2026 |
| 423-723 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 423-732 | Verizon Wireless | Mobile carrier | 2015 |
| 423-765 | Charter / Spectrum | Internet / business phone carrier | 2004 |
| 423-782 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 423-817 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 423-830 | Onvoy | Internet / business phone carrier | 2018 |
| 423-857 | CenturyLink / Lumen | Local phone company | – |
| 423-863 | Verizon Wireless | Mobile carrier | – |
| 423-963 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 423-967 | MetroPCS (T-Mobile) | Mobile carrier | – |
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.