Phone numbers in Walnut Creek, California
Walnut Creek has 103 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 27%
- Local phone company 34%
- Internet / business phone carrier 33%
- Paging service 4%
- Phone company 2%
Every prefix in Walnut Creek
Search the first six digits of a number in this list. If it's here, the number started in Walnut Creek with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 925-210 | AT&T (local phone) | Local phone company | – |
| 925-212 | AT&T Mobility | Mobile carrier | – |
| 925-213 | Spok | Paging service | – |
| 925-214 | Peerless Network Of California | Internet / business phone carrier | 2016 |
| 925-221 | 33 Wireless | Mobile carrier | – |
| 925-239 | Peerless Network Of California | Internet / business phone carrier | 2013 |
| 925-256 | AT&T (local phone) | Local phone company | – |
| 925-260 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 925-262 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-266 | Verizon Wireless | Mobile carrier | 2016 |
| 925-274 | AT&T (local phone) | Local phone company | – |
| 925-278 | Comcast | Internet / business phone carrier | 2013 |
| 925-279 | AT&T (local phone) | Local phone company | – |
| 925-280 | AT&T (local phone) | Local phone company | – |
| 925-285 | AT&T Mobility | Mobile carrier | – |
| 925-286 | AT&T Mobility | Mobile carrier | – |
| 925-287 | AT&T (local phone) | Local phone company | – |
| 925-289 | Onvoy | Internet / business phone carrier | 2009 |
| 925-295 | AT&T (local phone) | Local phone company | – |
| 925-296 | AT&T (local phone) | Local phone company | – |
| 925-300 | T-Mobile (including Sprint) | Mobile carrier | – |
| 925-322 | Bandwidth | Internet / business phone carrier | 2011 |
| 925-323 | AT&T Mobility | Mobile carrier | – |
| 925-324 | Verizon Wireless | Mobile carrier | 2002 |
| 925-330 | AT&T Mobility | Mobile carrier | 2001 |
| 925-333 | American Messaging Services | Paging service | – |
| 925-340 | Spok | Paging service | – |
| 925-342 | Commio | Internet / business phone carrier | – |
| 925-357 | Level 3 (Lumen) | Internet / business phone carrier | 2011 |
| 925-360 | AT&T Mobility | Mobile carrier | – |
| 925-378 | Verizon Wireless | Mobile carrier | 2014 |
| 925-393 | Onvoy | Internet / business phone carrier | 2015 |
| 925-395 | Teleport Communications America | Internet / business phone carrier | – |
| 925-407 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-430 | Comcast | Internet / business phone carrier | 2019 |
| 925-433 | Comcast | Internet / business phone carrier | 2015 |
| 925-440 | Verizon Wireless | Mobile carrier | 2018 |
| 925-448 | Verizon Wireless | Mobile carrier | 2014 |
| 925-451 | AT&T Mobility | Mobile carrier | – |
| 925-457 | T-Mobile (including Sprint) | Mobile carrier | – |
| 925-464 | Verizon Wireless | Mobile carrier | 2012 |
| 925-465 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-472 | AT&T (local phone) | Local phone company | – |
| 925-476 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 925-478 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-482 | Tpx Communications | Internet / business phone carrier | – |
| 925-488 | Peerless Network Of California | Internet / business phone carrier | 2019 |
| 925-512 | Onvoy | Internet / business phone carrier | 2023 |
| 925-527 | Utility Telecom Group | Phone company | – |
| 925-532 | Telnyx | Internet / business phone carrier | 2017 |
| 925-542 | Verizon Wireless | Mobile carrier | 2017 |
| 925-546 | TON80 Communications | Internet / business phone carrier | 2022 |
| 925-588 | Tpx Communications | Internet / business phone carrier | – |
| 925-627 | Tpx Communications | Internet / business phone carrier | 2001 |
| 925-639 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 925-651 | T-Mobile (including Sprint) | Mobile carrier | 2026 |
| 925-658 | Teleport Communications America | Internet / business phone carrier | – |
| 925-705 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 925-708 | Verizon Wireless | Mobile carrier | 2001 |
| 925-722 | Fractel | Internet / business phone carrier | 2021 |
| 925-744 | Fractel | Internet / business phone carrier | 2020 |
| 925-746 | AT&T (local phone) | Local phone company | – |
| 925-765 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 925-766 | T-Mobile (including Sprint) | Mobile carrier | – |
| 925-788 | Verizon Wireless | Mobile carrier | – |
| 925-817 | AT&T (local phone) | Local phone company | – |
| 925-818 | AT&T Mobility | Mobile carrier | – |
| 925-876 | AT&T Mobility | Mobile carrier | – |
| 925-891 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 925-899 | AT&T Mobility | Mobile carrier | – |
| 925-906 | AT&T (local phone) | Local phone company | – |
| 925-920 | Spok | Paging service | – |
| 925-926 | AT&T (local phone) | Local phone company | – |
| 925-927 | AT&T (local phone) | Local phone company | – |
| 925-930 | AT&T (local phone) | Local phone company | – |
| 925-932 | AT&T (local phone) | Local phone company | – |
| 925-933 | AT&T (local phone) | Local phone company | – |
| 925-934 | AT&T (local phone) | Local phone company | – |
| 925-935 | AT&T (local phone) | Local phone company | – |
| 925-937 | AT&T (local phone) | Local phone company | – |
| 925-938 | AT&T (local phone) | Local phone company | – |
| 925-939 | AT&T (local phone) | Local phone company | – |
| 925-940 | Onvoy | Internet / business phone carrier | – |
| 925-941 | AT&T (local phone) | Local phone company | – |
| 925-942 | AT&T (local phone) | Local phone company | – |
| 925-943 | AT&T (local phone) | Local phone company | – |
| 925-944 | AT&T (local phone) | Local phone company | – |
| 925-945 | AT&T (local phone) | Local phone company | – |
| 925-946 | AT&T (local phone) | Local phone company | – |
| 925-947 | AT&T (local phone) | Local phone company | – |
| 925-948 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-949 | Teleport Communications America | Internet / business phone carrier | – |
| 925-951 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-952 | AT&T (local phone) | Local phone company | – |
| 925-953 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-954 | Tpx Communications | Internet / business phone carrier | – |
| 925-955 | Utility Telecom Group | Phone company | – |
| 925-956 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-974 | AT&T (local phone) | Local phone company | – |
| 925-975 | AT&T (local phone) | Local phone company | – |
| 925-977 | AT&T (local phone) | Local phone company | – |
| 925-979 | AT&T (local phone) | Local phone company | – |
| 925-988 | 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.