Area code 351: where it is and who calls from it
Area code 351 is in Massachusetts.
Massachusetts (Ashby, Barre, Boxborough, Carlisle, Groveland, Rowley, Wendell, Wenham, and northeastern Massachusetts)
| Where | Massachusetts |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 2001 |
| Overlay | Yes, with 978 |
| Prefixes assigned | 92 of 792 possible (12%) |
Overlay: 351 covers the same area as 978. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 351 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 351, with how many prefixes each has.
Who holds 351 numbers
- Mobile carrier 24%
- Local phone company 2%
- Internet / business phone carrier 68%
- Phone company 5%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Onvoy | Internet / business phone carrier | 33 | 36% |
| T-Mobile (including Sprint) | Mobile carrier | 11 | 12% |
| Fractel | Internet / business phone carrier | 11 | 12% |
| TON80 Communications | Internet / business phone carrier | 7 | 8% |
| Verizon Wireless | Mobile carrier | 4 | 4% |
| Peerless Network Of Massachusetts | Internet / business phone carrier | 3 | 3% |
| Bandwidth | Internet / business phone carrier | 3 | 3% |
| MetroPCS (T-Mobile) | Mobile carrier | 3 | 3% |
| Tc Systems | Phone company | 2 | 2% |
| Comcast | Internet / business phone carrier | 2 | 2% |
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.
States served: Massachusetts.
Other area codes in Massachusetts
339 413 508 617 774 781 857 978
Got a call from 351?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 351 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.