Phone numbers in Thousand Oaks, California
Thousand Oaks has 66 phone prefixes in area codes 805, 820.
Biggest holders: Frontier, Verizon Wireless, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 47%
- Local phone company 29%
- Internet / business phone carrier 18%
- Paging service 3%
- Phone company 3%
Every prefix in Thousand Oaks
Search the first six digits of a number in this list. If it's here, the number started in Thousand Oaks with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 805-208 | Verizon Wireless | Mobile carrier | – |
| 805-217 | Verizon Wireless | Mobile carrier | – |
| 805-230 | Frontier | Local phone company | – |
| 805-231 | Verizon Wireless | Mobile carrier | – |
| 805-267 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 805-277 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 805-279 | Verizon Wireless | Mobile carrier | – |
| 805-300 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 805-309 | Peerless Network Of California | Internet / business phone carrier | 2009 |
| 805-313 | Comcast | Internet / business phone carrier | – |
| 805-338 | AT&T Mobility | Mobile carrier | 2001 |
| 805-341 | AT&T Mobility | Mobile carrier | 2001 |
| 805-353 | American Messaging Services | Paging service | – |
| 805-358 | AT&T Mobility | Mobile carrier | 2001 |
| 805-367 | AT&T (local phone) | Local phone company | – |
| 805-368 | Verizon Wireless | Mobile carrier | – |
| 805-370 | Frontier | Local phone company | – |
| 805-371 | Frontier | Local phone company | – |
| 805-372 | Frontier | Local phone company | – |
| 805-373 | Frontier | Local phone company | – |
| 805-374 | Frontier | Local phone company | – |
| 805-379 | Frontier | Local phone company | – |
| 805-381 | Frontier | Local phone company | – |
| 805-390 | Verizon Wireless | Mobile carrier | – |
| 805-405 | AT&T Mobility | Mobile carrier | – |
| 805-409 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 805-413 | Tpx Communications | Internet / business phone carrier | – |
| 805-418 | AT&T (local phone) | Local phone company | – |
| 805-432 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 805-435 | Utility Telecom Group | Phone company | – |
| 805-442 | Spok | Paging service | – |
| 805-446 | Frontier | Local phone company | – |
| 805-449 | Frontier | Local phone company | – |
| 805-494 | Frontier | Local phone company | – |
| 805-495 | Frontier | Local phone company | – |
| 805-496 | Frontier | Local phone company | – |
| 805-497 | Frontier | Local phone company | – |
| 805-506 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-551 | Verizon Wireless | Mobile carrier | – |
| 805-557 | Frontier | Local phone company | – |
| 805-558 | Verizon Wireless | Mobile carrier | – |
| 805-601 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 805-630 | Verizon Wireless | Mobile carrier | – |
| 805-657 | Verizon Wireless | Mobile carrier | – |
| 805-660 | Verizon Wireless | Mobile carrier | – |
| 805-719 | Tpx Communications | Internet / business phone carrier | – |
| 805-728 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 805-731 | 33 Wireless | Mobile carrier | – |
| 805-732 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-750 | Verizon Wireless | Mobile carrier | – |
| 805-777 | Frontier | Local phone company | – |
| 805-778 | Frontier | Local phone company | – |
| 805-795 | Verizon Wireless | Mobile carrier | – |
| 805-796 | Verizon Wireless | Mobile carrier | – |
| 805-807 | AT&T Mobility | Mobile carrier | – |
| 805-852 | Onvoy | Internet / business phone carrier | – |
| 805-857 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-870 | Onvoy | Internet / business phone carrier | – |
| 805-905 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-906 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-907 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 805-908 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-917 | Peerless Network Of California | Internet / business phone carrier | – |
| 805-953 | T-Mobile (including Sprint) | Mobile carrier | – |
| 820-200 | Advanced Telecom Solutions | Phone company | 2018 |
| 820-333 | Fractel | 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.