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AreaCode
Locations.
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Montana Area Codes
The state of Montana, USA is currently served by this single area code:
406
Larger Montana cities and their area codes
City
County
Area code(s)
Billings
Yellowstone
406
Bozeman
Gallatin
406
Butte
Silver Bow
406
Great Falls
Cascade
406
Helena
Lewis And Clark
406
Missoula
Missoula
406