Phone numbers in Plymouth, California
Plymouth has 4 phone prefixes in area code 209.
Biggest holders: Onvoy, AT&T (local phone), Comcast. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 25%
- Internet / business phone carrier 75%
Every prefix in Plymouth
Search the first six digits of a number in this list. If it's here, the number started in Plymouth with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 209-245 | AT&T (local phone) | Local phone company | – |
| 209-680 | Comcast | Internet / business phone carrier | – |
| 209-893 | Onvoy | Internet / business phone carrier | – |
| 209-970 | Onvoy | Internet / business phone carrier | 2022 |
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.