Phone numbers in Ignacio, California
Ignacio has 19 phone prefixes in area codes 415, 628.
Biggest holders: Onvoy, AT&T (local phone), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 16%
- Local phone company 21%
- Internet / business phone carrier 63%
Every prefix in Ignacio
Search the first six digits of a number in this list. If it's here, the number started in Ignacio with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 415-234 | Onvoy | Internet / business phone carrier | – |
| 415-251 | Onvoy | Internet / business phone carrier | 2006 |
| 415-382 | AT&T (local phone) | Local phone company | – |
| 415-475 | Onvoy | Internet / business phone carrier | – |
| 415-483 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 415-506 | AT&T (local phone) | Local phone company | – |
| 415-612 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 415-763 | Teleport Communications America | Internet / business phone carrier | – |
| 415-842 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 415-881 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 415-883 | AT&T (local phone) | Local phone company | – |
| 415-884 | AT&T (local phone) | Local phone company | – |
| 415-996 | Bandwidth | Internet / business phone carrier | 2014 |
| 628-238 | Peerless Network Of California | Internet / business phone carrier | – |
| 628-259 | AT&T Mobility | Mobile carrier | 2017 |
| 628-307 | AT&T Mobility | Mobile carrier | 2024 |
| 628-377 | Fractel | Internet / business phone carrier | 2021 |
| 628-433 | Bandwidth | Internet / business phone carrier | 2019 |
| 628-666 | Onvoy | 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.