Phone numbers in Ronkonkoma, New York
Ronkonkoma has 28 phone prefixes in area codes 631, 934.
Biggest holders: Verizon (local phone), T-Mobile (including Sprint), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 14%
- Local phone company 36%
- Internet / business phone carrier 43%
- Phone company 7%
Every prefix in Ronkonkoma
Search the first six digits of a number in this list. If it's here, the number started in Ronkonkoma with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 631-202 | Onvoy | Internet / business phone carrier | 2016 |
| 631-285 | Verizon (local phone) | Local phone company | – |
| 631-389 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-428 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 631-467 | Verizon (local phone) | Local phone company | – |
| 631-468 | Verizon (local phone) | Local phone company | – |
| 631-471 | Verizon (local phone) | Local phone company | – |
| 631-542 | Telengy | Phone company | 2012 |
| 631-580 | Verizon (local phone) | Local phone company | – |
| 631-585 | Verizon (local phone) | Local phone company | – |
| 631-588 | Verizon (local phone) | Local phone company | – |
| 631-590 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-615 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-619 | Tc Systems | Phone company | – |
| 631-648 | Cablevision Lightpath | Internet / business phone carrier | – |
| 631-676 | Csc Voice | Internet / business phone carrier | 2004 |
| 631-710 | Cablevision Lightpath | Internet / business phone carrier | 2018 |
| 631-718 | MetroPCS (T-Mobile) | Mobile carrier | 2025 |
| 631-737 | Verizon (local phone) | Local phone company | – |
| 631-738 | Verizon (local phone) | Local phone company | – |
| 631-739 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 631-820 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 631-913 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 631-981 | Verizon (local phone) | Local phone company | – |
| 934-246 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 934-255 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 934-263 | TON80 Communications | Internet / business phone carrier | 2022 |
| 934-949 | 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.