Phone numbers in Northfield, Minnesota
Northfield has 14 phone prefixes in area code 507.
Biggest holders: Onvoy, T-Mobile (including Sprint), CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 43%
- Local phone company 21%
- Internet / business phone carrier 36%
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 Minnesota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 507-222 | Onvoy | Internet / business phone carrier | – |
| 507-301 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 507-321 | AT&T Mobility | Mobile carrier | – |
| 507-366 | Onvoy | Internet / business phone carrier | – |
| 507-403 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 507-581 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 507-645 | CenturyLink / Lumen | Local phone company | – |
| 507-646 | Onvoy | Internet / business phone carrier | – |
| 507-649 | Verizon Wireless | Mobile carrier | – |
| 507-650 | Onvoy | Internet / business phone carrier | – |
| 507-663 | CenturyLink / Lumen | Local phone company | – |
| 507-664 | CenturyLink / Lumen | Local phone company | – |
| 507-786 | Onvoy | Internet / business phone carrier | – |
| 507-850 | AT&T Mobility | Mobile 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.