Phone numbers in Smithtown, New York
Smithtown has 24 phone prefixes in area codes 631, 934.
Biggest holders: Verizon (local phone), T-Mobile (including Sprint), Cablevision Lightpath. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 33%
- Internet / business phone carrier 33%
- Phone company 4%
Every prefix in Smithtown
Search the first six digits of a number in this list. If it's here, the number started in Smithtown with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 631-240 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 631-257 | Cablevision Lightpath | Internet / business phone carrier | 2012 |
| 631-263 | Verizon Wireless | Mobile carrier | – |
| 631-265 | Verizon (local phone) | Local phone company | – |
| 631-352 | T-Mobile (including Sprint) | Mobile carrier | 2010 |
| 631-360 | Verizon (local phone) | Local phone company | – |
| 631-361 | Verizon (local phone) | Local phone company | – |
| 631-366 | Verizon (local phone) | Local phone company | – |
| 631-382 | Verizon (local phone) | Local phone company | – |
| 631-406 | Rcn Telecom Services | Phone company | – |
| 631-652 | MCImetro (Verizon Business) | Internet / business phone carrier | 2014 |
| 631-656 | Cablevision Lightpath | Internet / business phone carrier | – |
| 631-672 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 631-724 | Verizon (local phone) | Local phone company | – |
| 631-780 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 631-863 | Verizon (local phone) | Local phone company | – |
| 631-974 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 631-979 | Verizon (local phone) | Local phone company | – |
| 631-982 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 631-986 | Onvoy | Internet / business phone carrier | 2021 |
| 934-221 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 934-223 | Cablevision Lightpath | Internet / business phone carrier | 2016 |
| 934-227 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 934-260 | Verizon Wireless | Mobile carrier | 2025 |
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.