Phone numbers in Folsom, California
Folsom has 73 phone prefixes in area codes 279, 916.
Biggest holders: AT&T (local phone), Onvoy, Bandwidth. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 25%
- Local phone company 30%
- Internet / business phone carrier 44%
- Phone company 1%
Every prefix in Folsom
Search the first six digits of a number in this list. If it's here, the number started in Folsom with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 279-215 | Bandwidth | Internet / business phone carrier | 2021 |
| 279-219 | Bandwidth | Internet / business phone carrier | 2022 |
| 279-235 | MetroPCS (T-Mobile) | Mobile carrier | 2022 |
| 279-239 | Onvoy | Internet / business phone carrier | 2023 |
| 279-245 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 279-256 | Onvoy | Internet / business phone carrier | 2024 |
| 279-258 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 279-264 | Onvoy | Internet / business phone carrier | 2024 |
| 279-267 | Bandwidth | Internet / business phone carrier | 2024 |
| 279-278 | Onvoy | Internet / business phone carrier | 2021 |
| 279-289 | Onvoy | Internet / business phone carrier | 2022 |
| 279-321 | Onvoy | Internet / business phone carrier | – |
| 279-356 | Fractel | Internet / business phone carrier | 2020 |
| 279-465 | Fractel | Internet / business phone carrier | 2020 |
| 279-732 | Fractel | Internet / business phone carrier | 2021 |
| 279-842 | Fractel | Internet / business phone carrier | 2020 |
| 916-220 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 916-221 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 916-235 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 916-260 | AT&T Mobility | Mobile carrier | 2016 |
| 916-292 | Verizon Wireless | Mobile carrier | 2012 |
| 916-293 | MCImetro (Verizon Business) | Internet / business phone carrier | 2004 |
| 916-294 | AT&T (local phone) | Local phone company | – |
| 916-337 | AT&T Mobility | Mobile carrier | – |
| 916-350 | AT&T (local phone) | Local phone company | – |
| 916-351 | AT&T (local phone) | Local phone company | – |
| 916-353 | AT&T (local phone) | Local phone company | – |
| 916-355 | AT&T (local phone) | Local phone company | – |
| 916-356 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 916-357 | AT&T (local phone) | Local phone company | – |
| 916-358 | AT&T (local phone) | Local phone company | – |
| 916-365 | Tpx Communications | Internet / business phone carrier | – |
| 916-370 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 916-377 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 916-404 | Onvoy | Internet / business phone carrier | – |
| 916-413 | Verizon Wireless | Mobile carrier | 2017 |
| 916-439 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 916-458 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 916-461 | Verizon Wireless | Mobile carrier | 2015 |
| 916-467 | AT&T Enterprises | Phone company | 2006 |
| 916-496 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 916-500 | Onvoy | Internet / business phone carrier | – |
| 916-510 | T-Mobile (including Sprint) | Mobile carrier | 2020 |
| 916-542 | Bandwidth | Internet / business phone carrier | 2012 |
| 916-586 | AT&T Mobility | Mobile carrier | 2014 |
| 916-597 | Bandwidth | Internet / business phone carrier | 2013 |
| 916-605 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 916-608 | AT&T (local phone) | Local phone company | – |
| 916-618 | Teleport Communications America | Internet / business phone carrier | 2019 |
| 916-673 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 916-693 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 916-790 | Verizon Wireless | Mobile carrier | 2010 |
| 916-805 | Onvoy | Internet / business phone carrier | 2014 |
| 916-817 | AT&T (local phone) | Local phone company | – |
| 916-836 | Bandwidth | Internet / business phone carrier | 2015 |
| 916-850 | Teleport Communications America | Internet / business phone carrier | – |
| 916-906 | Verizon Wireless | Mobile carrier | 2021 |
| 916-932 | Allstream | Internet / business phone carrier | – |
| 916-933 | AT&T (local phone) | Local phone company | – |
| 916-934 | AT&T (local phone) | Local phone company | – |
| 916-935 | AT&T (local phone) | Local phone company | – |
| 916-936 | AT&T Mobility | Mobile carrier | 2014 |
| 916-939 | AT&T (local phone) | Local phone company | – |
| 916-941 | AT&T (local phone) | Local phone company | – |
| 916-954 | Bandwidth | Internet / business phone carrier | 2021 |
| 916-983 | AT&T (local phone) | Local phone company | – |
| 916-984 | AT&T (local phone) | Local phone company | – |
| 916-985 | AT&T (local phone) | Local phone company | – |
| 916-986 | AT&T (local phone) | Local phone company | – |
| 916-987 | AT&T (local phone) | Local phone company | – |
| 916-988 | AT&T (local phone) | Local phone company | – |
| 916-989 | AT&T (local phone) | Local phone company | – |
| 916-990 | 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.