Phone numbers in Cobleskill, New York
Cobleskill has 7 phone prefixes in area codes 518, 838.
Biggest holders: Verizon (local phone), Tc Systems, Middleburgh Telephone Ld. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 14%
- Local phone company 29%
- Internet / business phone carrier 14%
- Phone company 43%
Every prefix in Cobleskill
Search the first six digits of a number in this list. If it's here, the number started in Cobleskill with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 518-234 | Verizon (local phone) | Local phone company | – |
| 518-254 | Verizon (local phone) | Local phone company | – |
| 518-255 | Tc Systems | Phone company | – |
| 518-517 | Middleburgh Telephone Ld | Phone company | 2015 |
| 518-657 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 518-823 | Firstlight Fiber | Internet / business phone carrier | – |
| 838-248 | Stratus Networks | Phone company | 2021 |
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.