Phone numbers in Monterey, California
Monterey has 64 phone prefixes in area code 831.
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 17%
- Local phone company 44%
- Internet / business phone carrier 31%
- Phone company 8%
Every prefix in Monterey
Search the first six digits of a number in this list. If it's here, the number started in Monterey with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 831-200 | Peerless Network Of California | Internet / business phone carrier | 2014 |
| 831-204 | Onvoy | Internet / business phone carrier | – |
| 831-215 | Hd Carrier | Internet / business phone carrier | 2020 |
| 831-220 | Vonage America | Internet / business phone carrier | 2018 |
| 831-224 | T-Mobile (including Sprint) | Mobile carrier | – |
| 831-230 | Telnyx | Internet / business phone carrier | 2016 |
| 831-233 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 831-236 | Verizon Wireless | Mobile carrier | – |
| 831-241 | AT&T (local phone) | Local phone company | – |
| 831-242 | AT&T (local phone) | Local phone company | – |
| 831-259 | Tpx Communications | Internet / business phone carrier | 2022 |
| 831-264 | Bandwidth | Internet / business phone carrier | – |
| 831-275 | Bandwidth | Internet / business phone carrier | 2008 |
| 831-277 | Verizon Wireless | Mobile carrier | – |
| 831-282 | IP Horizon | Internet / business phone carrier | 2021 |
| 831-312 | Csc Voice | Internet / business phone carrier | 2024 |
| 831-317 | Leap Telecom | Phone company | 2024 |
| 831-324 | Comcast | Internet / business phone carrier | – |
| 831-333 | AT&T (local phone) | Local phone company | – |
| 831-372 | AT&T (local phone) | Local phone company | – |
| 831-373 | AT&T (local phone) | Local phone company | – |
| 831-375 | AT&T (local phone) | Local phone company | – |
| 831-383 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 831-384 | AT&T (local phone) | Local phone company | – |
| 831-392 | AT&T (local phone) | Local phone company | – |
| 831-393 | AT&T (local phone) | Local phone company | – |
| 831-394 | AT&T (local phone) | Local phone company | – |
| 831-402 | AT&T Mobility | Mobile carrier | 2001 |
| 831-468 | Exiant Communications | Phone company | 2026 |
| 831-521 | AT&T Mobility | Mobile carrier | – |
| 831-582 | AT&T (local phone) | Local phone company | – |
| 831-583 | AT&T (local phone) | Local phone company | – |
| 831-601 | Verizon Wireless | Mobile carrier | – |
| 831-641 | AT&T (local phone) | Local phone company | – |
| 831-642 | AT&T (local phone) | Local phone company | – |
| 831-643 | AT&T (local phone) | Local phone company | – |
| 831-644 | AT&T (local phone) | Local phone company | – |
| 831-645 | AT&T (local phone) | Local phone company | – |
| 831-646 | AT&T (local phone) | Local phone company | – |
| 831-647 | AT&T (local phone) | Local phone company | – |
| 831-648 | AT&T (local phone) | Local phone company | – |
| 831-649 | AT&T (local phone) | Local phone company | – |
| 831-655 | AT&T (local phone) | Local phone company | – |
| 831-656 | AT&T (local phone) | Local phone company | – |
| 831-657 | AT&T (local phone) | Local phone company | – |
| 831-658 | AT&T (local phone) | Local phone company | – |
| 831-717 | Twilio | Internet / business phone carrier | – |
| 831-718 | MCImetro (Verizon Business) | Internet / business phone carrier | 2005 |
| 831-747 | AT&T Enterprises | Phone company | 2005 |
| 831-760 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 831-855 | Peerless Network Of California | Internet / business phone carrier | – |
| 831-867 | Commio | Internet / business phone carrier | 2017 |
| 831-869 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 831-880 | 8X8 | Internet / business phone carrier | 2026 |
| 831-881 | Wide Voice | Phone company | 2025 |
| 831-883 | AT&T (local phone) | Local phone company | – |
| 831-884 | AT&T (local phone) | Local phone company | – |
| 831-886 | Nuso | Internet / business phone carrier | – |
| 831-887 | Terra Nova Telecom | Internet / business phone carrier | – |
| 831-899 | AT&T (local phone) | Local phone company | – |
| 831-901 | Wavenation | Phone company | – |
| 831-915 | AT&T Mobility | Mobile carrier | – |
| 831-917 | AT&T Mobility | Mobile carrier | – |
| 831-920 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
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.