Phone numbers in Butte, Montana
Butte has 17 phone prefixes in area code 406.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 35%
- Internet / business phone carrier 29%
- Phone company 6%
Every prefix in Butte
Search the first six digits of a number in this list. If it's here, the number started in Butte with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-221 | Onvoy | Internet / business phone carrier | 2003 |
| 406-299 | Level 3 (Lumen) | Internet / business phone carrier | 2003 |
| 406-310 | Blackfoot Communications | Phone company | – |
| 406-479 | Verizon Wireless | Mobile carrier | 2013 |
| 406-490 | Verizon Wireless | Mobile carrier | – |
| 406-491 | AT&T Mobility | Mobile carrier | – |
| 406-494 | CenturyLink / Lumen | Local phone company | – |
| 406-496 | CenturyLink / Lumen | Local phone company | – |
| 406-497 | CenturyLink / Lumen | Local phone company | – |
| 406-498 | Verizon Wireless | Mobile carrier | – |
| 406-533 | CenturyLink / Lumen | Local phone company | – |
| 406-565 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 406-593 | AT&T Mobility | Mobile carrier | – |
| 406-605 | Telnyx | Internet / business phone carrier | 2021 |
| 406-723 | CenturyLink / Lumen | Local phone company | – |
| 406-782 | CenturyLink / Lumen | Local phone company | – |
| 406-792 | 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.