Phone numbers in Big Sky, Montana
Big Sky has 3 phone prefixes in area code 406.
Biggest holders: 3 Rivers Tel. Coop, Montana Opticom. This is the local calling area (rate center) where those prefixes were first assigned.
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Every prefix in Big Sky
Search the first six digits of a number in this list. If it's here, the number started in Big Sky with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-993 | 3 Rivers Tel. Coop | Phone company | – |
| 406-995 | 3 Rivers Tel. Coop | Phone company | – |
| 406-999 | Montana Opticom | Phone company | 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.