Montana Area Codes
1 area codes in Montana, United States. Country code: +1. Find area codes by city and region.
All Montana Area Codes
| Area Code | Major Cities | Region |
|---|---|---|
| 406 | Billings, Helena | Statewide |
About Montana Area Codes
Montana uses 1 area codes under the North American Numbering Plan (NANP). When calling within Montana, dial the 3-digit area code followed by the 7-digit phone number. From abroad: exit code + 1 + area code + number.