Montana area codes
Montana has a single active area code. The original 1947 code was 406.
The busiest codes by active prefixes are 406 (Billings).
Time zone is uniform across the state's codes: Mountain.
A statewide single code is getting rare in the NANP — most states have long since added overlays. 406 still covers everything from Billings to Great Falls on one code.
406, in service since 1947, anchors Billings, carries 753 active prefixes across 260 rate centers, split among 62 carriers. 525 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is the only area code serving Montana. NANPA projects its capacity to last until 4Q 2033. Local dialing is ten digits.
Numbers in the toll-free 8YY family are absent here by design: they carry no state assignment and answer anywhere in the US, Canada and the Caribbean.
Use the per-code pages to go deeper — coverage by locality, full prefix tables for the most-searched codes, and NANPA's capacity forecasts for each.
| Code | Major area | In service | Overlay complex | Prefixes |
|---|---|---|---|---|
| 406 | Billings | 1947 | — | 753 |
FAQ
How many area codes does Montana have?
1 geographic area code is currently in service: 406.
Will Montana get a new area code soon?
Not soon. The earliest exhaust forecast in the state is 406 at 4Q 2033, so current codes have ample capacity.
Which time zone are Montana numbers in?
All Montana area codes are in the Mountain time zone.