Phone numbers in Greenwich, Rhode Island
Greenwich has 16 phone prefixes in area code 401.
Biggest holders: Verizon (local phone), Windstream (PAETEC), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 25%
- Internet / business phone carrier 62%
Every prefix in Greenwich
Search the first six digits of a number in this list. If it's here, the number started in Greenwich with the carrier shown. If it isn't, check the Rhode Island page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 401-203 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 401-219 | T-Mobile (including Sprint) | Mobile carrier | – |
| 401-234 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 401-317 | Telnyx | Internet / business phone carrier | 2016 |
| 401-336 | Teleport Communications America | Internet / business phone carrier | – |
| 401-398 | Comcast | Internet / business phone carrier | – |
| 401-402 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 401-471 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 401-541 | Verizon (local phone) | Local phone company | – |
| 401-542 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 401-557 | Teleport Communications America | Internet / business phone carrier | 2025 |
| 401-558 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 401-715 | Onvoy | Internet / business phone carrier | – |
| 401-884 | Verizon (local phone) | Local phone company | – |
| 401-885 | Verizon (local phone) | Local phone company | – |
| 401-886 | Verizon (local phone) | Local phone company | – |
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.