Montana area codes
Montana has used a single area code, 406, since 1947. Every Montana number starts with it, so the code tells you the state and nothing more specific.
Updated 28 July 2026
The Montana area code
Montana uses a single area code, 406, and has done since 1947. Every Montana number starts with it.
Montana area code map
Montana sits in the Mountain Time zone.
Spam call reports in Montana
These Montana area codes drew the most reports to the FTC in the 30 days to 28 July 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 |
|---|---|---|
| 406 | Billings | 315 |
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 28 July 2026. Request a correction.
Calls from your Montana numbers not landing?
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 28 July 2026, with 315 numbers reported.
Neighbouring states