Phone numbers in Central Islip, New York
Central Islip has 41 phone prefixes in area codes 516, 631, 934.
Biggest holders: T-Mobile (including Sprint), Verizon (local phone), Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 37%
- Local phone company 24%
- Internet / business phone carrier 32%
- Phone company 7%
Every prefix in Central Islip
Search the first six digits of a number in this list. If it's here, the number started in Central Islip with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 516-607 | T-Mobile (including Sprint) | Mobile carrier | – |
| 516-810 | T-Mobile (including Sprint) | Mobile carrier | – |
| 516-909 | T-Mobile (including Sprint) | Mobile carrier | – |
| 516-983 | T-Mobile (including Sprint) | Mobile carrier | – |
| 516-991 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-203 | Onvoy | Internet / business phone carrier | – |
| 631-232 | Verizon (local phone) | Local phone company | – |
| 631-234 | Verizon (local phone) | Local phone company | – |
| 631-272 | Verizon (local phone) | Local phone company | – |
| 631-297 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-334 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-342 | Verizon (local phone) | Local phone company | – |
| 631-348 | Verizon (local phone) | Local phone company | – |
| 631-415 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-431 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-439 | Cablevision Lightpath | Internet / business phone carrier | – |
| 631-452 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 631-463 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-523 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-533 | MCImetro (Verizon Business) | Internet / business phone carrier | 2009 |
| 631-582 | Verizon (local phone) | Local phone company | – |
| 631-630 | Cablevision Lightpath | Internet / business phone carrier | – |
| 631-664 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-715 | Tc Systems | Phone company | – |
| 631-761 | Cablevision Lightpath | Internet / business phone carrier | – |
| 631-778 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 631-784 | Tc Systems | Phone company | – |
| 631-787 | Tc Systems | Phone company | – |
| 631-822 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-851 | Verizon (local phone) | Local phone company | – |
| 631-853 | Verizon (local phone) | Local phone company | – |
| 631-870 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-881 | AT&T (local phone) | Local phone company | – |
| 631-882 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 631-904 | Verizon (local phone) | Local phone company | – |
| 631-930 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-963 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 934-220 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 934-252 | Csc Wireless | Mobile carrier | 2023 |
| 934-432 | Fractel | Internet / business phone carrier | 2021 |
| 934-666 | Evolve Cellular | Mobile carrier | 2016 |
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.