Phone numbers in Westminster, California
Westminster has 105 phone prefixes in area codes 657, 714.
Biggest holders: Verizon Wireless, Frontier, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 65%
- Local phone company 17%
- Internet / business phone carrier 16%
- Phone company 2%
Every prefix in Westminster
Search the first six digits of a number in this list. If it's here, the number started in Westminster with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 657-200 | MetroPCS (T-Mobile) | Mobile carrier | 2008 |
| 657-227 | Charter / Spectrum | Internet / business phone carrier | 2014 |
| 657-257 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 657-271 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 657-277 | Peerless Network Of California | Internet / business phone carrier | 2015 |
| 657-288 | Verizon Wireless | Mobile carrier | 2015 |
| 657-302 | Verizon Wireless | Mobile carrier | 2016 |
| 657-306 | Verizon Wireless | Mobile carrier | 2016 |
| 657-318 | Verizon Wireless | Mobile carrier | 2016 |
| 657-334 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 657-340 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 657-349 | Verizon Wireless | Mobile carrier | 2016 |
| 657-350 | Verizon Wireless | Mobile carrier | 2016 |
| 657-352 | AT&T Mobility | Mobile carrier | 2017 |
| 657-364 | Verizon Wireless | Mobile carrier | – |
| 657-367 | Verizon Wireless | Mobile carrier | 2018 |
| 657-368 | AT&T Mobility | Mobile carrier | 2018 |
| 657-370 | Verizon Wireless | Mobile carrier | 2019 |
| 657-376 | AT&T Mobility | Mobile carrier | 2019 |
| 657-384 | AT&T Mobility | Mobile carrier | 2019 |
| 657-400 | Onvoy | Internet / business phone carrier | – |
| 657-402 | Verizon Wireless | Mobile carrier | 2019 |
| 657-407 | Verizon Wireless | Mobile carrier | 2019 |
| 657-420 | Verizon Wireless | Mobile carrier | 2020 |
| 657-425 | AT&T Mobility | Mobile carrier | 2020 |
| 657-431 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 657-435 | Verizon Wireless | Mobile carrier | 2020 |
| 657-441 | Verizon Wireless | Mobile carrier | – |
| 657-443 | Vonage America | Internet / business phone carrier | 2020 |
| 657-447 | Verizon Wireless | Mobile carrier | 2020 |
| 657-458 | Verizon Wireless | Mobile carrier | 2020 |
| 657-463 | Verizon Wireless | Mobile carrier | 2020 |
| 657-471 | Verizon Wireless | Mobile carrier | 2020 |
| 657-491 | Verizon Wireless | Mobile carrier | 2021 |
| 657-524 | Verizon Wireless | Mobile carrier | 2021 |
| 657-528 | Verizon Wireless | Mobile carrier | 2021 |
| 657-548 | Verizon Wireless | Mobile carrier | 2022 |
| 657-551 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 657-552 | Verizon Wireless | Mobile carrier | 2021 |
| 657-559 | Verizon Wireless | Mobile carrier | 2022 |
| 657-593 | Verizon Wireless | Mobile carrier | 2022 |
| 657-599 | Fractel | Internet / business phone carrier | 2021 |
| 657-621 | Verizon Wireless | Mobile carrier | 2022 |
| 657-629 | Bandwidth | Internet / business phone carrier | 2022 |
| 657-666 | Onvoy | Internet / business phone carrier | – |
| 657-670 | Onvoy | Internet / business phone carrier | 2023 |
| 657-698 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 657-746 | TON80 Communications | Internet / business phone carrier | 2022 |
| 657-765 | AT&T Mobility | Mobile carrier | 2024 |
| 657-770 | Barr Tell USA | Phone company | 2022 |
| 657-779 | AT&T Mobility | Mobile carrier | 2024 |
| 657-790 | Verizon Wireless | Mobile carrier | 2025 |
| 657-807 | Verizon Wireless | Mobile carrier | 2025 |
| 657-840 | Verizon Wireless | Mobile carrier | 2025 |
| 657-849 | Verizon Wireless | Mobile carrier | 2026 |
| 657-870 | Verizon Wireless | Mobile carrier | 2026 |
| 657-876 | Verizon Wireless | Mobile carrier | 2026 |
| 657-887 | Verizon Wireless | Mobile carrier | 2026 |
| 657-955 | Fractel | Internet / business phone carrier | 2020 |
| 657-977 | Fractel | Internet / business phone carrier | 2019 |
| 714-217 | Verizon Wireless | Mobile carrier | 2024 |
| 714-222 | Verizon Wireless | Mobile carrier | – |
| 714-230 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 714-248 | Level 3 (Lumen) | Internet / business phone carrier | 2007 |
| 714-334 | Verizon Wireless | Mobile carrier | – |
| 714-372 | Frontier | Local phone company | – |
| 714-373 | Frontier | Local phone company | – |
| 714-379 | Frontier | Local phone company | – |
| 714-413 | Verizon Wireless | Mobile carrier | 2025 |
| 714-487 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 714-514 | Verizon Wireless | Mobile carrier | – |
| 714-548 | T-Mobile (including Sprint) | Mobile carrier | 2006 |
| 714-614 | Verizon Wireless | Mobile carrier | – |
| 714-615 | Verizon Wireless | Mobile carrier | – |
| 714-622 | T-Mobile (including Sprint) | Mobile carrier | – |
| 714-650 | MetroPCS (T-Mobile) | Mobile carrier | 2007 |
| 714-653 | T-Mobile (including Sprint) | Mobile carrier | – |
| 714-657 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 714-677 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 714-702 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
| 714-722 | Verizon Wireless | Mobile carrier | 2006 |
| 714-725 | T-Mobile (including Sprint) | Mobile carrier | 2006 |
| 714-766 | T-Mobile (including Sprint) | Mobile carrier | – |
| 714-793 | Verizon Wireless | Mobile carrier | – |
| 714-799 | Frontier | Local phone company | – |
| 714-837 | T-Mobile (including Sprint) | Mobile carrier | 2005 |
| 714-857 | Shelcomm | Phone company | 2001 |
| 714-889 | AT&T (local phone) | Local phone company | – |
| 714-890 | Frontier | Local phone company | – |
| 714-891 | Frontier | Local phone company | – |
| 714-892 | Frontier | Local phone company | – |
| 714-893 | Frontier | Local phone company | – |
| 714-894 | Frontier | Local phone company | – |
| 714-895 | Frontier | Local phone company | – |
| 714-896 | Frontier | Local phone company | – |
| 714-897 | Frontier | Local phone company | – |
| 714-898 | Frontier | Local phone company | – |
| 714-899 | Frontier | Local phone company | – |
| 714-901 | Frontier | Local phone company | – |
| 714-902 | T-Mobile (including Sprint) | Mobile carrier | – |
| 714-903 | Frontier | Local phone company | – |
| 714-908 | Onvoy | Internet / business phone carrier | – |
| 714-933 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 714-934 | Frontier | Local phone company | – |
| 714-943 | Verizon Wireless | Mobile 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.