Phone numbers in Casselton, North Dakota
Casselton has 6 phone prefixes in area code 701.
Biggest holders: Onvoy, AT&T Mobility, Midcontinent Communications. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 17%
- Internet / business phone carrier 33%
- Phone company 17%
Every prefix in Casselton
Search the first six digits of a number in this list. If it's here, the number started in Casselton with the carrier shown. If it isn't, check the North Dakota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 701-346 | Midcontinent Communications | Phone company | 2007 |
| 701-347 | CenturyLink / Lumen | Local phone company | – |
| 701-501 | Onvoy | Internet / business phone carrier | 2019 |
| 701-506 | Onvoy | Internet / business phone carrier | – |
| 701-660 | AT&T Mobility | Mobile carrier | 2010 |
| 701-895 | AT&T Mobility | Mobile carrier | 2006 |
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.