Missoula, MT Area Code

Area code serving Missoula

Missoula sits in Montana, part of the West region and the Mountain Time zone. Its area code is 406, which covers the entire state of Montana. 406 has no overlay today, so every Missoula landline and mobile number with a local code starts with 406.

406 has served the area since 1947, as one of the original 1947 North American area codes. If the region runs low on numbers, regulators will most likely add an overlay code on top rather than split the area, which would make 10-digit dialing mandatory.

Code	Area served	In service
406	The entire state of Montana	January 1, 1947

Nearby cities sharing this area code

• Billings
• Great Falls
• Bozeman
• Butte
• Helena
• Kalispell
• Belgrade
• Havre
• Anaconda
• Miles City
• Livingston
• Whitefish
• Lewistown

Getting a Missoula phone number

Any new landline, mobile or VoIP number from a local carrier in Missoula gets the 406 area code. Numbers come from the blocks each carrier holds in the area; a number ported in from elsewhere keeps its original area code, so you may also see out-of-state codes locally.

Dialing in Missoula

Missoula is covered by the single area code 406 with no overlay, so some local calls may still connect with seven digits. Dialing all 10 digits (area code + seven-digit number) always works and is the safest habit. From outside the US, dial +1, then the area code and number. See 10-digit dialing and overlay area codes for the background. For every code in Montana, visit the Montana area codes page.