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Montana Area Codes

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State: Montana (MT)
Area Codes: 1
Timezone: Mountain (MDT)
Current Time: 7:46 PM

About Montana Area Codes

Montana (MT) uses 1 telephone area code to serve its residents and businesses. With an estimated population of 842,286, Montana is one of the smaller states in the North American Numbering Plan (NANP). The state is primarily in the Mountain Time Zone (MDT). The current local time in Montana is 7:46 PM.

The largest cities in Montana include Billings (pop. 120,728), Missoula (pop. 92,895), Great Falls (pop. 65,131), Bozeman (pop. 57,695) and Helena (pop. 52,936) . Montana has 56 counties spread across its territory. Each area code in MT covers a geographic region of the state, with some areas using overlay codes that share the same geographic territory as an existing area code.

When calling a Montana phone number from outside the area code, you must dial the full 10-digit number: the 3-digit area code followed by the 7-digit local number. Many parts of Montana now require 10-digit dialing even for local calls due to overlay area codes and the nationwide 988 Suicide & Crisis Lifeline implementation.

All Montana Area Codes

The table below lists every active area code in Montana, along with the major city served and other cities covered by each code.

Area Code Major City Other Cities
406 Billings Missoula, Great Falls, Bozeman, Helena, Kalispell, Butte, Belgrade, Havre and more

Largest Cities in Montana

These are the largest cities in Montana by population, along with their primary area codes and counties.

City Population County
Billings 120,728 Yellowstone County
Missoula 92,895 Missoula County
Great Falls 65,131 Cascade County
Bozeman 57,695 Gallatin County
Helena 52,936 Lewis and Clark County
Kalispell 39,182 Flathead County
Butte 34,207 Silver Bow County
Belgrade 17,743 Gallatin County
Havre 10,155 Hill County
Miles City 9,436 Custer County

Frequently Asked Questions

Montana has 1 active area code. These include 406 (Billings) .

Montana is primarily in the Mountain Time Zone (MDT). The current local time is 7:46 PM.

The area code covering the most cities in Montana is 406, which serves Billings and 193+ other communities.

Yes, most areas in Montana now require 10-digit dialing (area code + 7-digit number) for all local calls. This requirement was implemented across the United States starting in October 2021 to support the 988 Suicide & Crisis Lifeline. Even if you are calling within the same area code, you need to dial all 10 digits.

To call a Montana number from within the United States, dial the area code followed by the 7-digit phone number (e.g., 406-XXX-XXXX). From outside the US, dial your country's exit code, then 1 (the US country code), then the full 10-digit number.

Montana has 56 counties. The state's total estimated population is 842,286, spread across these counties and served by 1 area code.

Billings is served by area code 406 .
Montana at a Glance
  • Abbreviation MT
  • Area Codes 1
  • Population 842,286
  • Counties 56
  • Cities 360
  • Time Zone Mountain
  • Current Time 7:46 PM
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