Phone numbers in Colfax, California
Colfax has 6 phone prefixes in area code 530.
Biggest holders: Onvoy, Frontier, Teleport Communications America. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 17%
- Internet / business phone carrier 83%
Every prefix in Colfax
Search the first six digits of a number in this list. If it's here, the number started in Colfax with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 530-323 | Onvoy | Internet / business phone carrier | – |
| 530-346 | Frontier | Local phone company | – |
| 530-349 | Teleport Communications America | Internet / business phone carrier | – |
| 530-512 | Onvoy | Internet / business phone carrier | – |
| 530-819 | Bandwidth | Internet / business phone carrier | 2021 |
| 530-866 | Fractel | Internet / business phone carrier | 2020 |
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.