Montana Area Codes
Directory of all 1 telephone area codes assigned to Montana.
Montana phone numbers are served by 1 area code operating in the Mountain timezone.10-digit or 7-digit local dialing applies depending on the exact number. No area codes in Montana are currently flagged as high-risk scams.
Most populated prefix: area code 406 (Montana)
All Area Codes in Montana
Major Cities Served by Montana Area Codes
The most populous urban centers and census places covered by Montana's area codes, ranked by population.
Montana Area Code FAQs
Quick answers to common questions about Montana telephone area codes.
How many area codes does Montana have?
Montana has 1 area codes: 406.
What timezone do Montana area codes use?
Montana area codes operate in the Mountain timezone.
What is the most populated area code in Montana?
Area code 406 is the most populous prefix in Montana based on covered city population.
Does Montana use overlay area codes?
Montana currently has no overlay code pairs listed in our directory.
Are there scam area codes in Montana?
Montana has no area codes currently flagged as high-risk scams.
About Montana Area Codes & Phone Dialing Rules
When placing calls within Montana, ten-digit dialing (area code + 7-digit telephone number) is required in overlay regions where multiple area codes serve the same geographic boundaries.