Phone numbers in Riverhead, New York
Riverhead has 56 phone prefixes in area codes 631, 934.
Biggest holders: AT&T Mobility, Verizon (local phone), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 57%
- Local phone company 16%
- Internet / business phone carrier 20%
- Paging service 2%
- Phone company 5%
Every prefix in Riverhead
Search the first six digits of a number in this list. If it's here, the number started in Riverhead with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 631-208 | Verizon (local phone) | Local phone company | – |
| 631-255 | AT&T Mobility | Mobile carrier | 2002 |
| 631-284 | Verizon (local phone) | Local phone company | – |
| 631-369 | Verizon (local phone) | Local phone company | – |
| 631-375 | AT&T Mobility | Mobile carrier | 2001 |
| 631-381 | MetroPCS (T-Mobile) | Mobile carrier | 2016 |
| 631-405 | MCImetro (Verizon Business) | Internet / business phone carrier | 2011 |
| 631-461 | Verizon Wireless | Mobile carrier | 2011 |
| 631-466 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-494 | T-Mobile (including Sprint) | Mobile carrier | 2009 |
| 631-506 | Verizon (local phone) | Local phone company | – |
| 631-508 | Verizon Wireless | Mobile carrier | 2018 |
| 631-548 | Verizon (local phone) | Local phone company | – |
| 631-558 | Spok | Paging service | – |
| 631-566 | Level 3 (Lumen) | Internet / business phone carrier | 2006 |
| 631-574 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-591 | Cablevision Lightpath | Internet / business phone carrier | – |
| 631-599 | Verizon Wireless | Mobile carrier | – |
| 631-603 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 631-644 | Verizon Wireless | Mobile carrier | 2014 |
| 631-655 | Tc Systems | Phone company | – |
| 631-660 | T-Mobile (including Sprint) | Mobile carrier | – |
| 631-680 | AT&T Mobility | Mobile carrier | 2001 |
| 631-727 | Verizon (local phone) | Local phone company | – |
| 631-740 | Verizon Wireless | Mobile carrier | – |
| 631-745 | AT&T Mobility | Mobile carrier | 2002 |
| 631-830 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 631-833 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 631-852 | Verizon (local phone) | Local phone company | – |
| 631-871 | AT&T Mobility | Mobile carrier | 2002 |
| 631-875 | AT&T Mobility | Mobile carrier | 2001 |
| 631-902 | AT&T Mobility | Mobile carrier | 2002 |
| 631-905 | Verizon (local phone) | Local phone company | – |
| 631-914 | AT&T Mobility | Mobile carrier | 2024 |
| 631-915 | American Network | Phone company | – |
| 631-939 | MetroPCS (T-Mobile) | Mobile carrier | 2019 |
| 631-953 | Verizon (local phone) | Local phone company | – |
| 631-965 | AT&T Mobility | Mobile carrier | 2002 |
| 631-985 | Onvoy | Internet / business phone carrier | 2021 |
| 631-989 | Onvoy | Internet / business phone carrier | – |
| 934-230 | AT&T Mobility | Mobile carrier | 2022 |
| 934-231 | Verizon Wireless | Mobile carrier | 2022 |
| 934-235 | Verizon Wireless | Mobile carrier | 2022 |
| 934-236 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 934-240 | AT&T Mobility | Mobile carrier | 2023 |
| 934-242 | AT&T Mobility | Mobile carrier | 2023 |
| 934-248 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 934-261 | Verizon Wireless | Mobile carrier | 2025 |
| 934-264 | Shelcomm | Phone company | 2025 |
| 934-268 | AT&T Mobility | Mobile carrier | 2026 |
| 934-271 | AT&T Mobility | Mobile carrier | 2026 |
| 934-272 | AT&T Mobility | Mobile carrier | 2026 |
| 934-274 | AT&T Mobility | Mobile carrier | 2026 |
| 934-276 | T-Mobile (including Sprint) | Mobile carrier | 2026 |
| 934-768 | TON80 Communications | Internet / business phone carrier | 2022 |
| 934-899 | Fractel | 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.