Phone numbers in Sandstone, Minnesota
Sandstone has 6 phone prefixes in area code 320.
Biggest holders: Verizon Wireless, Onvoy, CenturyLink / Lumen. 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 50%
Every prefix in Sandstone
Search the first six digits of a number in this list. If it's here, the number started in Sandstone with the carrier shown. If it isn't, check the Minnesota page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 320-216 | Onvoy | Internet / business phone carrier | – |
| 320-245 | CenturyLink / Lumen | Local phone company | – |
| 320-372 | Verizon Wireless | Mobile carrier | 2008 |
| 320-375 | Verizon Wireless | Mobile carrier | 2003 |
| 320-742 | TON80 Communications | Internet / business phone carrier | 2022 |
| 320-999 | Terra Nova Telecom | Internet / business phone carrier | 2019 |
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.