Phone numbers in Watsonville, California
Watsonville has 30 phone prefixes in area code 831.
Biggest holders: AT&T (local phone), Onvoy, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 27%
- Internet / business phone carrier 50%
- Phone company 3%
Every prefix in Watsonville
Search the first six digits of a number in this list. If it's here, the number started in Watsonville with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 831-228 | Charter / Spectrum | Internet / business phone carrier | 2015 |
| 831-254 | AT&T Mobility | Mobile carrier | – |
| 831-274 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 831-284 | AT&T Mobility | Mobile carrier | 2023 |
| 831-285 | Bandwidth | Internet / business phone carrier | 2022 |
| 831-288 | Charter / Spectrum | Internet / business phone carrier | 2009 |
| 831-319 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 831-322 | Onvoy | Internet / business phone carrier | 2016 |
| 831-348 | Fractel | Internet / business phone carrier | 2019 |
| 831-353 | Onvoy | Internet / business phone carrier | 2016 |
| 831-406 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 831-498 | IP Horizon | Internet / business phone carrier | – |
| 831-536 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 831-539 | T-Mobile (including Sprint) | Mobile carrier | – |
| 831-587 | Fractel | Internet / business phone carrier | 2021 |
| 831-666 | Onvoy | Internet / business phone carrier | – |
| 831-707 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 831-722 | AT&T (local phone) | Local phone company | – |
| 831-724 | AT&T (local phone) | Local phone company | – |
| 831-726 | AT&T (local phone) | Local phone company | – |
| 831-728 | AT&T (local phone) | Local phone company | – |
| 831-740 | Teleport Communications America | Internet / business phone carrier | – |
| 831-750 | T-Mobile (including Sprint) | Mobile carrier | – |
| 831-761 | AT&T (local phone) | Local phone company | – |
| 831-763 | AT&T (local phone) | Local phone company | – |
| 831-768 | AT&T (local phone) | Local phone company | – |
| 831-786 | AT&T (local phone) | Local phone company | – |
| 831-840 | AT&T Mobility | Mobile carrier | – |
| 831-851 | Onvoy | Internet / business phone carrier | – |
| 831-948 | Utility Telecom Group | Phone company | 2015 |
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.