Phone numbers in Fire Island, New York
Fire Island has 7 phone prefixes in area codes 631, 934.
Biggest holders: Level 3 (Lumen), Onvoy, Tc Systems. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 14%
- Internet / business phone carrier 71%
- Phone company 14%
Every prefix in Fire Island
Search the first six digits of a number in this list. If it's here, the number started in Fire Island with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 631-437 | Tc Systems | Phone company | 2013 |
| 631-440 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-570 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-583 | Verizon (local phone) | Local phone company | – |
| 631-631 | Bandwidth | Internet / business phone carrier | 2022 |
| 631-817 | Onvoy | Internet / business phone carrier | – |
| 934-944 | Onvoy | Internet / business phone carrier | 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.