Montana area codes
Montana has one area code, 406, for all of Montana.
- Area codes
- 1
- Areas
- 1
- Overlay areas
- 0
- Time zone
- Mountain
- ZIP codes
- 404 in Montana
Somewhere in Montana now? What area code am I in? answers from your location.
Every Montana area code
| Code | Where | Overlays | Since |
|---|---|---|---|
| 406 | Billings, Missoula, Great Falls | none | 1947 |
Montana area codes by area
Codes that overlay one another share one area. The places listed have a telephone rate centre of their own in NANPA's records, largest first; each links to its ZIP codes.
406 — Billings
222 places, the largest 36 here (all of them on 406):
- Billings
- Missoula
- Great Falls
- Bozeman
- Butte
- Helena
- Kalispell
- Belgrade
- Anaconda
- Havre
- Livingston
- Whitefish
- Miles City
- Laurel
- Sidney
- Lewistown
- Columbia Falls
- Bigfork
- Polson
- Hamilton
- Glendive
- Dillon
- Hardin
- Shelby
- Glasgow
- Libby
- Cut Bank
- Deer Lodge
- Conrad
- Wolf Point
- Red Lodge
- Big Sky
- Lakeside
- Manhattan
- Stevensville
- West Glendive
8 counties:
Area codes of the largest cities in Montana
| City | Area codes | Population |
|---|---|---|
| Billings | 406 | 119,434 |
| Missoula | 406 | 76,514 |
| Great Falls | 406 | 60,329 |
| Bozeman | 406 | 56,114 |
| Butte-Silver Bow † | 406 | 35,052 |
| Butte | 406 | 34,732 |
| Helena | 406 | 33,639 |
| Kalispell | 406 | 28,504 |
| Belgrade | 406 | 11,872 |
| Evergreen † | 406 | 9,611 |
| Anaconda-Deer Lodge County † | 406 | 9,597 |
| Anaconda | 406 | 9,529 |
| Havre | 406 | 9,258 |
| Helena Valley Southeast † | 406 | 9,108 |
| Livingston | 406 | 8,780 |
| Whitefish | 406 | 8,749 |
| Miles City | 406 | 8,407 |
| Helena Valley West Central † | 406 | 8,056 |
| Laurel | 406 | 7,215 |
| Lockwood † | 406 | 7,181 |
| Sidney | 406 | 6,171 |
| Lewistown | 406 | 6,087 |
| Four Corners † | 406 | 5,791 |
| Columbia Falls | 406 | 5,615 |
| Orchard Homes † | 406 | 5,588 |
| Bigfork | 406 | 5,565 |
| Polson | 406 | 5,428 |
| Helena Valley Northwest † | 406 | 5,183 |
| Hamilton | 406 | 5,101 |
| Glendive | 406 | 4,810 |
| Helena Valley Northeast † | 406 | 4,659 |
| Lolo † | 406 | 4,314 |
| Malmstrom Afb † | 406 | 4,302 |
| Dillon | 406 | 4,085 |
| Hardin | 406 | 3,742 |
| Shelby | 406 | 3,216 |
| Glasgow | 406 | 3,190 |
| North Browning † | 406 | 3,144 |
| Montana City † | 406 | 3,092 |
| Libby | 406 | 3,042 |
† NANPA lists no rate centre for the town itself; these are the codes of the nearest one. A town on an area-code boundary can differ from its neighbour.
Questions about Montana area codes
How many area codes does Montana have?
One: 406.
What are the area codes of the largest cities in Montana?
Billings: 406. Missoula: 406. Great Falls: 406. Bozeman: 406. Butte-Silver Bow: 406.
What time zone are Montana area codes in?
Mountain time.
Every US area code · Montana ZIP codes
Source: NANPA NPA database and central office code assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Montana area codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-codes/mt
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