Phone numbers in Martinez, California
Martinez has 22 phone prefixes in area code 925.
Biggest holders: AT&T (local phone), Level 3 (Lumen), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 14%
- Local phone company 32%
- Internet / business phone carrier 55%
Every prefix in Martinez
Search the first six digits of a number in this list. If it's here, the number started in Martinez with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 925-228 | AT&T (local phone) | Local phone company | – |
| 925-229 | AT&T (local phone) | Local phone company | – |
| 925-231 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-269 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-293 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 925-313 | AT&T (local phone) | Local phone company | – |
| 925-316 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-335 | AT&T (local phone) | Local phone company | – |
| 925-369 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 925-370 | AT&T (local phone) | Local phone company | – |
| 925-372 | AT&T (local phone) | Local phone company | – |
| 925-374 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-387 | Teleport Communications America | Internet / business phone carrier | – |
| 925-500 | Onvoy | Internet / business phone carrier | – |
| 925-514 | AT&T Mobility | Mobile carrier | 2023 |
| 925-608 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 925-638 | Teleport Communications America | Internet / business phone carrier | 2026 |
| 925-723 | Tpx Communications | Internet / business phone carrier | – |
| 925-812 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 925-839 | Tpx Communications | Internet / business phone carrier | 2001 |
| 925-917 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 925-957 | AT&T (local phone) | Local phone company | – |
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.