Phone numbers in Hayward, California
Hayward has 130 phone prefixes in area codes 341, 510.
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 41%
- Local phone company 28%
- Internet / business phone carrier 28%
- Phone company 3%
Every prefix in Hayward
Search the first six digits of a number in this list. If it's here, the number started in Hayward with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 341-208 | AT&T Mobility | Mobile carrier | 2021 |
| 341-221 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 341-232 | Onvoy | Internet / business phone carrier | 2023 |
| 341-240 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 341-241 | Onvoy | Internet / business phone carrier | 2022 |
| 341-245 | Onvoy | Internet / business phone carrier | 2024 |
| 341-258 | AT&T Mobility | Mobile carrier | 2024 |
| 341-260 | Verizon Wireless | Mobile carrier | 2024 |
| 341-262 | AT&T Mobility | Mobile carrier | 2025 |
| 341-271 | Verizon Wireless | Mobile carrier | 2026 |
| 341-386 | Fractel | Internet / business phone carrier | 2021 |
| 341-777 | Wide Voice | Phone company | 2019 |
| 341-800 | Fractel | Internet / business phone carrier | 2019 |
| 510-200 | MetroPCS (T-Mobile) | Mobile carrier | 2008 |
| 510-209 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 510-244 | Bandwidth | Internet / business phone carrier | 2011 |
| 510-246 | Verizon Wireless | Mobile carrier | 2011 |
| 510-247 | AT&T (local phone) | Local phone company | – |
| 510-258 | AT&T (local phone) | Local phone company | – |
| 510-259 | AT&T (local phone) | Local phone company | – |
| 510-264 | AT&T (local phone) | Local phone company | – |
| 510-265 | AT&T (local phone) | Local phone company | – |
| 510-266 | AT&T (local phone) | Local phone company | – |
| 510-274 | Utility Telecom Group | Phone company | – |
| 510-276 | AT&T (local phone) | Local phone company | – |
| 510-278 | AT&T (local phone) | Local phone company | – |
| 510-293 | AT&T (local phone) | Local phone company | – |
| 510-294 | MetroPCS (T-Mobile) | Mobile carrier | 2011 |
| 510-300 | Tpx Communications | Internet / business phone carrier | – |
| 510-303 | AT&T Mobility | Mobile carrier | – |
| 510-305 | AT&T Mobility | Mobile carrier | – |
| 510-310 | Sequoia Wireless | Mobile carrier | 2026 |
| 510-314 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 510-315 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 510-317 | AT&T (local phone) | Local phone company | – |
| 510-329 | AT&T Mobility | Mobile carrier | – |
| 510-330 | Onvoy | Internet / business phone carrier | 2015 |
| 510-331 | AT&T Mobility | Mobile carrier | – |
| 510-340 | Verizon Wireless | Mobile carrier | 2012 |
| 510-342 | Tpx Communications | Internet / business phone carrier | – |
| 510-359 | Verizon Wireless | Mobile carrier | 2012 |
| 510-361 | Level 3 (Lumen) | Internet / business phone carrier | 2014 |
| 510-362 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 510-363 | Verizon Wireless | Mobile carrier | 2008 |
| 510-370 | Peerless Network Of California | Internet / business phone carrier | 2012 |
| 510-372 | Onvoy | Internet / business phone carrier | – |
| 510-397 | Comcast | Internet / business phone carrier | 2008 |
| 510-398 | Bandwidth | Internet / business phone carrier | 2012 |
| 510-415 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 510-427 | Verizon Wireless | Mobile carrier | – |
| 510-432 | AT&T Mobility | Mobile carrier | 2001 |
| 510-460 | Verizon Wireless | Mobile carrier | 2010 |
| 510-461 | AT&T Mobility | Mobile carrier | 2002 |
| 510-470 | Bandwidth | Internet / business phone carrier | 2010 |
| 510-481 | AT&T (local phone) | Local phone company | – |
| 510-512 | T-Mobile (including Sprint) | Mobile carrier | – |
| 510-514 | Peerless Network Of California | Internet / business phone carrier | 2016 |
| 510-537 | AT&T (local phone) | Local phone company | – |
| 510-538 | AT&T (local phone) | Local phone company | – |
| 510-546 | Onvoy | Internet / business phone carrier | 2024 |
| 510-554 | 33 Wireless | Mobile carrier | – |
| 510-566 | Verizon Wireless | Mobile carrier | – |
| 510-571 | AT&T Mobility | Mobile carrier | 2017 |
| 510-576 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-581 | AT&T (local phone) | Local phone company | – |
| 510-582 | AT&T (local phone) | Local phone company | – |
| 510-583 | AT&T (local phone) | Local phone company | – |
| 510-584 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-586 | Comcast | Internet / business phone carrier | – |
| 510-589 | AT&T Mobility | Mobile carrier | – |
| 510-600 | Onvoy | Internet / business phone carrier | – |
| 510-605 | Verizon Wireless | Mobile carrier | 2018 |
| 510-606 | Verizon Wireless | Mobile carrier | 2010 |
| 510-634 | Verizon Wireless | Mobile carrier | 2014 |
| 510-670 | AT&T (local phone) | Local phone company | – |
| 510-674 | Onvoy | Internet / business phone carrier | 2014 |
| 510-677 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 510-688 | T-Mobile (including Sprint) | Mobile carrier | – |
| 510-690 | AT&T (local phone) | Local phone company | – |
| 510-695 | Verizon Wireless | Mobile carrier | 2007 |
| 510-706 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 510-723 | AT&T (local phone) | Local phone company | – |
| 510-727 | AT&T (local phone) | Local phone company | – |
| 510-728 | AT&T (local phone) | Local phone company | – |
| 510-731 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-732 | AT&T (local phone) | Local phone company | – |
| 510-733 | AT&T (local phone) | Local phone company | – |
| 510-736 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 510-750 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 510-751 | Onvoy | Internet / business phone carrier | – |
| 510-754 | MetroPCS (T-Mobile) | Mobile carrier | 2002 |
| 510-755 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 510-760 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 510-780 | AT&T (local phone) | Local phone company | – |
| 510-781 | AT&T (local phone) | Local phone company | – |
| 510-782 | AT&T (local phone) | Local phone company | – |
| 510-783 | AT&T (local phone) | Local phone company | – |
| 510-784 | AT&T (local phone) | Local phone company | – |
| 510-785 | AT&T (local phone) | Local phone company | – |
| 510-786 | AT&T (local phone) | Local phone company | – |
| 510-807 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 510-819 | Onvoy | Internet / business phone carrier | 2024 |
| 510-825 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 510-826 | AT&T Mobility | Mobile carrier | 2016 |
| 510-828 | Verizon Wireless | Mobile carrier | 2001 |
| 510-856 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-861 | AT&T Mobility | Mobile carrier | – |
| 510-862 | AT&T Mobility | Mobile carrier | – |
| 510-876 | AT&T Enterprises | Phone company | 2014 |
| 510-880 | Onvoy | Internet / business phone carrier | – |
| 510-881 | AT&T (local phone) | Local phone company | – |
| 510-884 | Utility Telecom Group | Phone company | – |
| 510-885 | AT&T (local phone) | Local phone company | – |
| 510-886 | AT&T (local phone) | Local phone company | – |
| 510-887 | AT&T (local phone) | Local phone company | – |
| 510-888 | AT&T (local phone) | Local phone company | – |
| 510-889 | AT&T (local phone) | Local phone company | – |
| 510-892 | Onvoy | Internet / business phone carrier | – |
| 510-901 | Bandwidth | Internet / business phone carrier | 2016 |
| 510-909 | Verizon Wireless | Mobile carrier | – |
| 510-921 | Teleport Communications America | Internet / business phone carrier | – |
| 510-925 | Bandwidth | Internet / business phone carrier | 2014 |
| 510-931 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 510-935 | AT&T Mobility | Mobile carrier | 2014 |
| 510-940 | Tpx Communications | Internet / business phone carrier | – |
| 510-951 | Verizon Wireless | Mobile carrier | 2021 |
| 510-954 | Onvoy | Internet / business phone carrier | 2018 |
| 510-962 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 510-963 | AT&T Mobility | Mobile carrier | 2015 |
| 510-999 | 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.