Montana area codes
- Area code in
- 1
- State
- Montana
- Montana is served by a single area code, 406, in service since 1947.
- Updated 8 October 2026
Now in Montana
Mountain Time · UTC−7, UTC−6 in summer
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Mountain Time
Typical business hours, 9 to 5 Monday to Friday.
Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real Montana office is likely to answer. It says nothing about who called you.
01
The Montana area code
Montana uses a single area code, 406, and has done since 1947. Every Montana number starts with it.
02
Spam call reports in Montana
These Montana area codes drew the most reports to the FTC in the 30 days to 8 October 2026. The figures describe numbers displaying each code, which caller ID spoofing can fake.
Most reported Montana area codes · last 30 days
| # | Code | Primary city | Reports (30 days) |
|---|---|---|---|
| 1 | 406 | Billings | 559 |
A number listed here may itself be a spoofing victim rather than the caller. These are unverified consumer reports.
Source: FTC Do Not Call Reported Calls Data, unverified consumer reports, retrieved 8 October 2026. Request a correction. Month-over-month figures appear once two complete 30-day windows exist.
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03
Questions
How many area codes does Montana have?
Montana has 1 area code: 406.
What is the main area code for Billings?
The main area code for Billings is 406.
Which Montana area code is oldest?
Area code 406 is the oldest in Montana, in service since 1947.
Do I need to dial ten digits in Montana?
Not necessarily. Montana has no overlay codes, so seven-digit local dialling may still work in parts of the state.
Which Montana area code gets the most spam calls?
Area code 406 (Billings) drew the most reports of any Montana code in the 30 days to 8 October 2026, with 559 numbers reported.
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