Area codes in Great Falls, Montana
Great Falls, Montana uses area code 406. The main Great Falls area code is 406.
Area codes serving Great Falls
All Montana area codes · Is a Great Falls call a scam?
Nearby cities
- Bozeman area codes
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- Spokane area codes
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.