Phone numbers in Johnson City, Tennessee
Johnson City has 67 phone prefixes in area code 423.
Biggest holders: CenturyLink / Lumen, T-Mobile (including Sprint), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 24%
- Local phone company 34%
- Internet / business phone carrier 33%
- Paging service 3%
- Phone company 6%
Every prefix in Johnson City
Search the first six digits of a number in this list. If it's here, the number started in Johnson City with the carrier shown. If it isn't, check the Tennessee page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 423-202 | MCImetro (Verizon Business) | Internet / business phone carrier | 2003 |
| 423-218 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 423-232 | CenturyLink / Lumen | Local phone company | – |
| 423-233 | Pro Page Partners | Phone company | – |
| 423-262 | CenturyLink / Lumen | Local phone company | – |
| 423-268 | AT&T Mobility | Mobile carrier | 2012 |
| 423-282 | CenturyLink / Lumen | Local phone company | – |
| 423-283 | CenturyLink / Lumen | Local phone company | – |
| 423-302 | Bandwidth | Internet / business phone carrier | 2008 |
| 423-328 | Comcast | Internet / business phone carrier | 2008 |
| 423-410 | CenturyLink / Lumen | Local phone company | – |
| 423-412 | Spok | Paging service | – |
| 423-427 | Onvoy | Internet / business phone carrier | 2018 |
| 423-430 | Nuso | Internet / business phone carrier | 2013 |
| 423-431 | CenturyLink / Lumen | Local phone company | – |
| 423-433 | CenturyLink / Lumen | Local phone company | – |
| 423-434 | CenturyLink / Lumen | Local phone company | – |
| 423-439 | CenturyLink / Lumen | Local phone company | – |
| 423-461 | CenturyLink / Lumen | Local phone company | – |
| 423-483 | Verizon Wireless | Mobile carrier | 2002 |
| 423-491 | CenturyLink / Lumen | Local phone company | 2013 |
| 423-524 | Nuso | Internet / business phone carrier | 2018 |
| 423-549 | Vonage America | Internet / business phone carrier | 2018 |
| 423-557 | T-Mobile (including Sprint) | Mobile carrier | 2004 |
| 423-610 | CenturyLink / Lumen | Local phone company | – |
| 423-630 | Telescan | Phone company | 2007 |
| 423-631 | Charter / Spectrum | Internet / business phone carrier | 2008 |
| 423-656 | Csc Wireless | Mobile carrier | 2020 |
| 423-670 | IP Horizon | Internet / business phone carrier | 2020 |
| 423-672 | Telnyx | Internet / business phone carrier | 2019 |
| 423-673 | Windstream (PAETEC) | Internet / business phone carrier | 2021 |
| 423-676 | T-Mobile (including Sprint) | Mobile carrier | – |
| 423-705 | Nuso | Internet / business phone carrier | 2021 |
| 423-722 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 423-737 | AT&T Mobility | Mobile carrier | – |
| 423-741 | AT&T Mobility | Mobile carrier | – |
| 423-747 | AT&T Mobility | Mobile carrier | – |
| 423-767 | AT&T Mobility | Mobile carrier | 2001 |
| 423-773 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 423-791 | T-Mobile (including Sprint) | Mobile carrier | – |
| 423-794 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 423-795 | Spok | Paging service | – |
| 423-796 | Boost / Virgin Mobile | Mobile carrier | 2022 |
| 423-833 | T-Mobile (including Sprint) | Mobile carrier | – |
| 423-848 | Skyetel | Internet / business phone carrier | 2021 |
| 423-849 | AT&T Mobility | Mobile carrier | 2023 |
| 423-853 | Twilio | Internet / business phone carrier | 2022 |
| 423-854 | CenturyLink / Lumen | Local phone company | – |
| 423-880 | Onvoy | Internet / business phone carrier | 2021 |
| 423-900 | Onvoy | Internet / business phone carrier | 2011 |
| 423-905 | Onvoy | Internet / business phone carrier | 2021 |
| 423-906 | Callworks | Phone company | 2023 |
| 423-915 | CenturyLink / Lumen | Local phone company | – |
| 423-924 | Peerless Network Of Tennessee | Internet / business phone carrier | 2025 |
| 423-926 | CenturyLink / Lumen | Local phone company | – |
| 423-928 | CenturyLink / Lumen | Local phone company | – |
| 423-929 | CenturyLink / Lumen | Local phone company | – |
| 423-930 | Mountainet Telephone | Local phone company | 2009 |
| 423-938 | CenturyLink / Lumen | Local phone company | 2002 |
| 423-943 | T-Mobile (including Sprint) | Mobile carrier | – |
| 423-946 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 423-952 | CenturyLink / Lumen | Local phone company | – |
| 423-953 | CenturyLink / Lumen | Local phone company | – |
| 423-975 | CenturyLink / Lumen | Local phone company | – |
| 423-979 | CenturyLink / Lumen | Local phone company | – |
| 423-981 | Wavenation | Phone company | 2025 |
| 423-995 | Hd Carrier | Internet / business phone carrier | 2025 |
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.