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), serving Billings, Helena. Each code follows the 3-digit format and covers a defined geographic region within the state.
Major Cities and Their Area Codes
Find which area code serves each major city in Montana.
| City / Community | Area Code(s) |
|---|---|
| Billings | 406 |
| Helena | 406 |
How to Call Montana
Within the US: dial 1 + area code + 7-digit number (10-digit dialing applies where overlays are active).
From Canada or the Caribbean: the same NANP format applies — 1 + area code + number.
From abroad: dial your country's exit code (011 from the US, 00 from most countries, or + on mobile), then 1, then the Montana area code and number.
Example (from the UK): 00 1 406 XXX XXXX
Data source: North American Numbering Plan Administration (NANPA), ITU-T E.164. Area code assignments change with new overlays — verify with your carrier before dialing. NANPA