State · 1 area codes

Montana area codes

Montana is served by a single statewide area code (406) covering Billings, Missoula and Great Falls.

A · Metros

Major metro areas

Billings Missoula Great Falls

B · Directory

Every code opens its profile — codes with a full write-up show their place; the rest show live numbering data while their detailed profile is added.

406

Sources

List of NANP area codes (secondary)

Compiled by North American Numbers, last checked 2026-09-19. How this is made.