Phone numbers in Willows, California
Willows has 6 phone prefixes in area code 530.
Biggest holders: T-Mobile (including Sprint), IP Horizon, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 17%
- Internet / business phone carrier 50%
Every prefix in Willows
Search the first six digits of a number in this list. If it's here, the number started in Willows with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 530-330 | T-Mobile (including Sprint) | Mobile carrier | – |
| 530-361 | IP Horizon | Internet / business phone carrier | – |
| 530-685 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 530-804 | Onvoy | Internet / business phone carrier | – |
| 530-934 | AT&T (local phone) | Local phone company | – |
| 530-943 | Boost / Virgin Mobile | Mobile carrier | 2023 |
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.