Phone numbers in Rio Vista, California
Rio Vista has 5 phone prefixes in area code 707.
Biggest holders: Frontier, Level 3 (Lumen), IP Horizon. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 40%
- Internet / business phone carrier 40%
Every prefix in Rio Vista
Search the first six digits of a number in this list. If it's here, the number started in Rio Vista with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 707-374 | Frontier | Local phone company | – |
| 707-375 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 707-378 | Frontier | Local phone company | 2010 |
| 707-507 | IP Horizon | Internet / business phone carrier | – |
| 707-960 | 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.