🇺🇸 406 area code
Area code 406 covers Billings, Missoula, Bozeman and Helena and the surrounding area in Montana. Enter a 406 number below for a free check before you call back.
- Location: Billings, Montana
- Time zone: Mountain (UTC−7)
- In service since 1947
Consultar un número
Validez, operador, tipo de línea y región en la primera pasada.
Area code 406 at a glance
- Area code
- 406
- Location
- Montana, United States
- Main cities
- Billings, Missoula, Bozeman, Helena, Great Falls, Kalispell
- Time zone
- Mountain (UTC−7)
- Local time now
- —
- In service since
- 1947
- Local calls
- Dial 10 digits
- Number format
- (406) 555-0123
- From abroad
- +1 406 555 0123
Cities in area code 406
- Billings
- Missoula
- Bozeman
- Helena
- Great Falls
- Kalispell
- Butte
- Miles City
- Conrad
- Eureka
Is a 406 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 406 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 406 number to people in Montana because a local-looking call is more likely to be answered. If a 406 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 406
406 is one of the original North American area codes, created in 1947 when AT&T and the Bell System first divided the continent into numbering plan areas.
Preguntas frecuentes
Area code 406 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 406?
Area code 406 is in Montana, United States. It covers Billings, Missoula, Bozeman, Helena, Great Falls and Kalispell.
What time zone is area code 406?
406 is in the Mountain (UTC−7) time zone, and observes daylight saving time.
When did area code 406 start?
406 entered service in 1947.
How do I find out who called me from 406?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 406?
If you live in or near Montana, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 406 callers who will not leave a message are best looked up before you call back.
Got a call from 406?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.