Phone numbers in Dorchester, Massachusetts
Dorchester has 35 phone prefixes in area codes 617, 857.
Biggest holders: Verizon (local phone), Onvoy, MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 11%
- Local phone company 31%
- Internet / business phone carrier 51%
- Phone company 6%
Every prefix in Dorchester
Search the first six digits of a number in this list. If it's here, the number started in Dorchester with the carrier shown. If it isn't, check the Massachusetts page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 617-265 | Verizon (local phone) | Local phone company | – |
| 617-282 | Verizon (local phone) | Local phone company | – |
| 617-287 | Verizon (local phone) | Local phone company | – |
| 617-288 | Verizon (local phone) | Local phone company | – |
| 617-297 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 617-326 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-379 | Rcn Telecom Services | Phone company | – |
| 617-436 | Verizon (local phone) | Local phone company | – |
| 617-446 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-474 | Verizon (local phone) | Local phone company | – |
| 617-506 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 617-514 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-533 | Verizon (local phone) | Local phone company | – |
| 617-704 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 617-707 | Norfolk County Internet | Phone company | – |
| 617-740 | Verizon (local phone) | Local phone company | – |
| 617-781 | Commio | Internet / business phone carrier | 2024 |
| 617-822 | Verizon (local phone) | Local phone company | – |
| 617-825 | Verizon (local phone) | Local phone company | – |
| 617-905 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 617-929 | Verizon (local phone) | Local phone company | – |
| 617-979 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 857-212 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 857-217 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 857-220 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 857-271 | Onvoy | Internet / business phone carrier | – |
| 857-309 | Onvoy | Internet / business phone carrier | 2014 |
| 857-375 | Onvoy | Internet / business phone carrier | 2021 |
| 857-385 | AT&T Mobility | Mobile carrier | 2016 |
| 857-418 | Tpx Communications | Internet / business phone carrier | 2022 |
| 857-567 | Onvoy | Internet / business phone carrier | 2020 |
| 857-587 | Hd Carrier | Internet / business phone carrier | – |
| 857-663 | Onvoy | Internet / business phone carrier | – |
| 857-688 | Fractel | Internet / business phone carrier | 2021 |
| 857-847 | 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.