Phone numbers in Castleton-on-Hudson, New York
Castleton-on-Hudson has 6 phone prefixes in area codes 518, 838.
Biggest holders: Tc Systems, Verizon (local phone), Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 17%
- Internet / business phone carrier 50%
- Phone company 33%
Every prefix in Castleton-on-Hudson
Search the first six digits of a number in this list. If it's here, the number started in Castleton-on-Hudson with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 518-336 | Tc Systems | Phone company | – |
| 518-732 | Verizon (local phone) | Local phone company | – |
| 518-754 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 838-384 | Coretel New York | Phone company | 2019 |
| 838-599 | Fractel | Internet / business phone carrier | 2021 |
| 838-883 | Onvoy | Internet / business phone carrier | 2020 |
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.