406 Area Code — Billings, MT
Area code 406 serves Billings and 4 other cities in Montana. Local time follows America/Denver. It has no overlay codes.
- State
- Montana
- Primary city
- Billings
- Timezone
- America/Denver
- In service since
- 1947
- Type
- Geographic
- Overlay codes
- None
Cities Served by 406
The 406 area code covers 5 cities and communities in Montana.
- Billings
- Missoula
- Great Falls
- Bozeman
- Helena
About Area Code 406
Area code 406 is a North American Numbering Plan (NANP) area code that has been in service since 1947. It is administered by NANPA on behalf of the FCC and serves the Montana region anchored on Billings.
406 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 406 line.
Mobile numbers in 406 are portable: a person who moved away from Billings may still carry a 406 mobile number on their device. If you receive an unexpected call from a 406 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in Montana, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of Montana.
406 Area Code FAQ
Where is area code 406?
Area code 406 is located in Montana, primarily serving Billings and surrounding cities including Missoula, Great Falls, Bozeman. The region operates on MT (America/Denver) time.
What state is 406 area code?
406 is a Montana area code. It was put into service in 1947 and has no overlay codes — it covers its geographic area exclusively.
Is 406 a scam area code?
406 is a legitimate North American area code allocated by NANPA to Montana. Like any geographic area code, scammers sometimes spoof 406 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 406 use?
Area code 406 operates on MT (America/Denver). Numbers in this area code follow standard Montana time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 406 phone number?
Yes. Use the reverse lookup widget above to enter a full 406 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.