Phone numbers in Wasco, California
Wasco has 8 phone prefixes in area code 661.
Biggest holders: Level 3 (Lumen), IP Horizon, Twilio. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 12%
- Internet / business phone carrier 75%
Every prefix in Wasco
Search the first six digits of a number in this list. If it's here, the number started in Wasco with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 661-240 | IP Horizon | Internet / business phone carrier | – |
| 661-438 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 661-560 | Twilio | Internet / business phone carrier | – |
| 661-590 | Tpx Communications | Internet / business phone carrier | 2022 |
| 661-758 | AT&T (local phone) | Local phone company | – |
| 661-759 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 661-772 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 661-884 | Onvoy | 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.