Phone numbers in Pittsburg, California
Pittsburg has 19 phone prefixes in area code 925.
Biggest holders: AT&T (local phone), AT&T Mobility, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 26%
- Local phone company 32%
- Internet / business phone carrier 37%
- Phone company 5%
Every prefix in Pittsburg
Search the first six digits of a number in this list. If it's here, the number started in Pittsburg with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 925-203 | AT&T Mobility | Mobile carrier | 2002 |
| 925-220 | Verizon Wireless | Mobile carrier | 2023 |
| 925-252 | AT&T (local phone) | Local phone company | – |
| 925-267 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-318 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-427 | AT&T (local phone) | Local phone company | – |
| 925-431 | AT&T (local phone) | Local phone company | – |
| 925-432 | AT&T (local phone) | Local phone company | – |
| 925-439 | AT&T (local phone) | Local phone company | – |
| 925-473 | AT&T (local phone) | Local phone company | – |
| 925-492 | Commio | Internet / business phone carrier | 2021 |
| 925-526 | Tpx Communications | Internet / business phone carrier | – |
| 925-547 | Boost / Virgin Mobile | Mobile carrier | 2026 |
| 925-573 | North County Communication | Phone company | – |
| 925-597 | Verizon Wireless | Mobile carrier | – |
| 925-635 | Teleport Communications America | Internet / business phone carrier | – |
| 925-665 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 925-698 | AT&T Mobility | Mobile carrier | – |
| 925-799 | Fractel | Internet / business phone carrier | 2019 |
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.