Phone numbers in Richmond, California
Richmond has 63 phone prefixes in area codes 341, 510.
Biggest holders: AT&T (local phone), Bandwidth, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 25%
- Internet / business phone carrier 44%
- Paging service 2%
Every prefix in Richmond
Search the first six digits of a number in this list. If it's here, the number started in Richmond with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 341-203 | Verizon Wireless | Mobile carrier | 2021 |
| 341-207 | Bandwidth | Internet / business phone carrier | 2021 |
| 341-215 | Bandwidth | Internet / business phone carrier | 2022 |
| 341-230 | Onvoy | Internet / business phone carrier | 2023 |
| 341-242 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 341-247 | Onvoy | Internet / business phone carrier | 2024 |
| 341-300 | Fractel | Internet / business phone carrier | 2020 |
| 341-388 | Fractel | Internet / business phone carrier | 2021 |
| 341-799 | Fractel | Internet / business phone carrier | 2020 |
| 341-999 | Fractel | Internet / business phone carrier | 2019 |
| 510-210 | Bandwidth | Internet / business phone carrier | 2013 |
| 510-215 | AT&T (local phone) | Local phone company | – |
| 510-221 | MetroPCS (T-Mobile) | Mobile carrier | 2007 |
| 510-230 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 510-231 | AT&T (local phone) | Local phone company | – |
| 510-232 | AT&T (local phone) | Local phone company | – |
| 510-233 | AT&T (local phone) | Local phone company | – |
| 510-234 | AT&T (local phone) | Local phone company | – |
| 510-235 | AT&T (local phone) | Local phone company | – |
| 510-236 | AT&T (local phone) | Local phone company | – |
| 510-237 | AT&T (local phone) | Local phone company | – |
| 510-242 | AT&T (local phone) | Local phone company | – |
| 510-253 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 510-255 | Bandwidth | Internet / business phone carrier | 2011 |
| 510-260 | Comcast | Internet / business phone carrier | – |
| 510-307 | AT&T (local phone) | Local phone company | – |
| 510-323 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-334 | AT&T Mobility | Mobile carrier | – |
| 510-349 | American Messaging Services | Paging service | – |
| 510-367 | AT&T Mobility | Mobile carrier | – |
| 510-369 | Onvoy | Internet / business phone carrier | 2016 |
| 510-374 | AT&T (local phone) | Local phone company | – |
| 510-375 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 510-412 | AT&T (local phone) | Local phone company | – |
| 510-426 | Verizon Wireless | Mobile carrier | 2014 |
| 510-439 | Onvoy | Internet / business phone carrier | – |
| 510-447 | MetroPCS (T-Mobile) | Mobile carrier | 2011 |
| 510-478 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-609 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 510-619 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 510-620 | AT&T (local phone) | Local phone company | – |
| 510-621 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 510-660 | AT&T Mobility | Mobile carrier | 2015 |
| 510-672 | Verizon Wireless | Mobile carrier | 2002 |
| 510-680 | CenturyLink / Lumen | Local phone company | 2013 |
| 510-685 | Verizon Wireless | Mobile carrier | – |
| 510-730 | Bandwidth | Internet / business phone carrier | 2010 |
| 510-734 | AT&T Mobility | Mobile carrier | – |
| 510-776 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 510-778 | Comcast | Internet / business phone carrier | 2006 |
| 510-806 | Level 3 (Lumen) | Internet / business phone carrier | 2016 |
| 510-829 | MetroPCS (T-Mobile) | Mobile carrier | 2014 |
| 510-831 | Bandwidth | Internet / business phone carrier | 2020 |
| 510-837 | Teleport Communications America | Internet / business phone carrier | – |
| 510-860 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 510-890 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 510-932 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 510-942 | Teleport Communications America | Internet / business phone carrier | 2014 |
| 510-965 | AT&T (local phone) | Local phone company | – |
| 510-966 | Onvoy | Internet / business phone carrier | 2024 |
| 510-970 | AT&T (local phone) | Local phone company | – |
| 510-974 | Level 3 (Lumen) | Internet / business phone carrier | 2014 |
| 510-994 | Bandwidth | 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.