Phone numbers in Atascadero, California
Atascadero has 22 phone prefixes in area codes 805, 820.
Biggest holders: T-Mobile (including Sprint), AT&T (local phone), Tpx Communications. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 45%
- Local phone company 27%
- Internet / business phone carrier 27%
Every prefix in Atascadero
Search the first six digits of a number in this list. If it's here, the number started in Atascadero with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 805-391 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-460 | AT&T (local phone) | Local phone company | – |
| 805-461 | AT&T (local phone) | Local phone company | – |
| 805-462 | AT&T (local phone) | Local phone company | – |
| 805-464 | AT&T (local phone) | Local phone company | – |
| 805-466 | AT&T (local phone) | Local phone company | – |
| 805-468 | AT&T (local phone) | Local phone company | – |
| 805-470 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 805-538 | Tpx Communications | Internet / business phone carrier | 2006 |
| 805-539 | T-Mobile (including Sprint) | Mobile carrier | – |
| 805-703 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 805-792 | Tpx Communications | Internet / business phone carrier | 2001 |
| 805-859 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 805-952 | T-Mobile (including Sprint) | Mobile carrier | – |
| 820-203 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 820-208 | Tpx Communications | Internet / business phone carrier | 2022 |
| 820-217 | Boost / Virgin Mobile | Mobile carrier | 2023 |
| 820-237 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 820-241 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 820-246 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 820-786 | Fractel | Internet / business phone carrier | 2021 |
| 820-998 | Onvoy | Internet / business phone carrier | 2024 |
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.