Phone numbers in Groton, Massachusetts
Groton has 9 phone prefixes in area codes 351, 978.
Biggest holders: Verizon Wireless, Verizon (local phone), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 22%
- Local phone company 22%
- Internet / business phone carrier 44%
- Phone company 11%
Every prefix in Groton
Search the first six digits of a number in this list. If it's here, the number started in Groton with the carrier shown. If it isn't, check the Massachusetts page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 351-251 | Onvoy | Internet / business phone carrier | 2021 |
| 978-272 | Bandwidth | Internet / business phone carrier | – |
| 978-302 | Verizon Wireless | Mobile carrier | 2001 |
| 978-448 | Verizon (local phone) | Local phone company | – |
| 978-449 | Verizon (local phone) | Local phone company | – |
| 978-708 | Peerless Network Of Massachusetts | Internet / business phone carrier | 2013 |
| 978-732 | Tc Systems | Phone company | – |
| 978-842 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 978-877 | Verizon Wireless | Mobile carrier | 2002 |
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.