Phone numbers in Tuolumne, California
Tuolumne has 6 phone prefixes in area codes 209, 350.
Biggest holders: AT&T Mobility, Verizon Wireless, Frontier. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 67%
- Local phone company 17%
- Internet / business phone carrier 17%
Every prefix in Tuolumne
Search the first six digits of a number in this list. If it's here, the number started in Tuolumne with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 209-206 | AT&T Mobility | Mobile carrier | 2007 |
| 209-352 | AT&T Mobility | Mobile carrier | – |
| 209-459 | Verizon Wireless | Mobile carrier | 2016 |
| 209-703 | Verizon Wireless | Mobile carrier | 2020 |
| 209-928 | Frontier | Local phone company | – |
| 350-210 | Onvoy | Internet / business phone 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.