Phone numbers in Somerville, Massachusetts
Somerville has 29 phone prefixes in area codes 617, 857.
Biggest holders: Verizon (local phone), MCImetro (Verizon Business), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 10%
- Local phone company 34%
- Internet / business phone carrier 48%
- Phone company 7%
Every prefix in Somerville
Search the first six digits of a number in this list. If it's here, the number started in Somerville with the carrier shown. If it isn't, check the Massachusetts page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 617-284 | Verizon (local phone) | Local phone company | – |
| 617-440 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-501 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 617-591 | Verizon (local phone) | Local phone company | – |
| 617-616 | Tc Systems | Phone company | – |
| 617-623 | Verizon (local phone) | Local phone company | – |
| 617-625 | Verizon (local phone) | Local phone company | – |
| 617-627 | Verizon (local phone) | Local phone company | – |
| 617-628 | Verizon (local phone) | Local phone company | – |
| 617-629 | Verizon (local phone) | Local phone company | – |
| 617-666 | Verizon (local phone) | Local phone company | – |
| 617-684 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-702 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-718 | Rcn Telecom Services | Phone company | – |
| 617-741 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-764 | Comcast | Internet / business phone carrier | – |
| 617-767 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 617-776 | Verizon (local phone) | Local phone company | – |
| 617-863 | Verizon (local phone) | Local phone company | – |
| 617-941 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-996 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 857-227 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 857-388 | Commio | Internet / business phone carrier | 2021 |
| 857-467 | TON80 Communications | Internet / business phone carrier | 2022 |
| 857-523 | Verizon Wireless | Mobile carrier | 2001 |
| 857-575 | Onvoy | Internet / business phone carrier | 2021 |
| 857-822 | Onvoy | Internet / business phone carrier | 2024 |
| 857-995 | Onvoy | Internet / business phone carrier | – |
| 857-997 | Hd Carrier | Internet / business phone carrier | – |
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.