Phone numbers in Boulder Creek, California
Boulder Creek has 9 phone prefixes in area code 831.
Biggest holders: MCImetro (Verizon Business), Onvoy, Teleport Communications America. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 11%
- Internet / business phone carrier 89%
Every prefix in Boulder Creek
Search the first six digits of a number in this list. If it's here, the number started in Boulder Creek with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 831-217 | Teleport Communications America | Internet / business phone carrier | – |
| 831-337 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 831-338 | AT&T (local phone) | Local phone company | – |
| 831-366 | TON80 Communications | Internet / business phone carrier | 2022 |
| 831-432 | Fractel | Internet / business phone carrier | 2020 |
| 831-533 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 831-610 | Onvoy | Internet / business phone carrier | – |
| 831-618 | Onvoy | Internet / business phone carrier | – |
| 831-703 | Level 3 (Lumen) | 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.