Montana Area Codes

1 active area code · Billings · Population around 772,132

Montana has 1 active area code, serving cities like Billings, Missoula, and Great Falls. A single area code covers the whole state. Each code below links to its cities, carriers, timezone, and coverage map.

Montana Area Code Map

Map of Montana showing the area covered by its area codes

What area codes does Montana have?

406
Billings
Mountain Time (MT) · 364 cities · 772,848

Which cities are the largest in Montana?

#	City	Area Codes	Population
1	Anaconda-Deer Lodge County	406	9,811
2	Belgrade	406	12,741
3	Billings	406	121,483
4	Bozeman	406	57,894
5	Butte-Silver Bow	406	33,525
6	Great Falls	406	60,013
7	Helena	406	34,729
8	Kalispell	406	31,296
9	Missoula	406	78,204
10	Whitefish	406	9,256

* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.

Frequently Asked Questions

How many area codes does Montana have?

Montana has 1 active area code: 406.

What is the main area code for Montana?

The 406 area code is among the primary area codes for Montana, serving Billings and surrounding communities.

What are the largest cities in Montana?

The largest cities in Montana include Billings, Missoula, Great Falls, Bozeman, Helena.

What is the total population of Montana?

Montana has an estimated total population of 772,132 based on US Census PEP 2024 data.