Phone numbers in Firebaugh, California
Firebaugh has 7 phone prefixes in area codes 357, 559.
Biggest holders: Onvoy, Level 3 (Lumen), IP Horizon. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 14%
- Local phone company 14%
- Internet / business phone carrier 71%
Every prefix in Firebaugh
Search the first six digits of a number in this list. If it's here, the number started in Firebaugh with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 357-333 | Onvoy | Internet / business phone carrier | 2026 |
| 559-296 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 559-407 | IP Horizon | Internet / business phone carrier | – |
| 559-657 | Onvoy | Internet / business phone carrier | – |
| 559-659 | AT&T (local phone) | Local phone company | – |
| 559-694 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 559-933 | TON80 Communications | Internet / business phone 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.