Phone numbers in Yountville, California
Yountville has 10 phone prefixes in area code 707.
Biggest holders: AT&T (local phone), Level 3 (Lumen), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 30%
- Internet / business phone carrier 50%
Every prefix in Yountville
Search the first six digits of a number in this list. If it's here, the number started in Yountville with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 707-204 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 707-312 | Verizon Wireless | Mobile carrier | – |
| 707-339 | Verizon Wireless | Mobile carrier | – |
| 707-415 | Teleport Communications America | Internet / business phone carrier | 2010 |
| 707-531 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 707-754 | Onvoy | Internet / business phone carrier | – |
| 707-944 | AT&T (local phone) | Local phone company | – |
| 707-945 | AT&T (local phone) | Local phone company | – |
| 707-947 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 707-948 | AT&T (local phone) | Local phone company | – |
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.