Phone numbers in Northfield, Massachusetts
Northfield has 5 phone prefixes in area code 413.
Biggest holders: Onvoy, Tc Systems, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 20%
- Internet / business phone carrier 60%
- Phone company 20%
Every prefix in Northfield
Search the first six digits of a number in this list. If it's here, the number started in Northfield with the carrier shown. If it isn't, check the Massachusetts page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 413-225 | Tc Systems | Phone company | – |
| 413-239 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 413-392 | Onvoy | Internet / business phone carrier | 2021 |
| 413-498 | Verizon (local phone) | Local phone company | – |
| 413-845 | Onvoy | 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.