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406 Area Code

Area code 406 serves Billings, Missoula, Great Falls, Bozeman, Butte-Silver Bow and nearby communities in Montana. It has been in service since January 1, 1947.

StateMontana
Time zoneMountain
Local time now…
Prefixes in use754
Projected to run out2033
BillingsMissoulaGreat FallsBozemanButte-Silver BowHelenaKalispellBelgradeAnaconda-Deer Lodge CountyHelena Valley SoutheastWhitefishLivingstonHavreEvergreenMiles CityHelena Valley West CentralLockwoodLaurelSidneyLewistownColumbia FallsPolsonFour CornersHamiltonOrchard HomesBigforkHelena Valley NorthwestBillingsMissoulaGreat FallsBozemanButte-Silver BowHelena
Cities and towns served by area code 406

Who issues 406 numbers

Mobile 28%VoIP and cable 16%Landline 56%

Share of the 754 prefixes (the three digits after 406) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Lumen (Qwest)132
Verizon Wireless119
AT&T Mobility74
Onvoy (Sinch)45
Triangle Tel. Coop. Assn.39
Nemont Tel Coop33
Lumen (Level 3)27
Mid-Rivers Tel. Coop.27

Cities and towns in area code 406

CityPopulationOther area codes
Billings121,239
Missoula78,903
Great Falls60,208
Bozeman58,814
Butte-Silver Bow35,469
Helena35,138
Kalispell31,851
Belgrade13,107
Anaconda-Deer Lodge County9,709
Helena Valley Southeast9,533
Whitefish9,358
Livingston9,290
Havre9,264
Evergreen8,908
Miles City8,450
Helena Valley West Central8,224
Lockwood7,474
Laurel7,205
Sidney6,217
Lewistown6,179
Columbia Falls5,753
Polson5,653
Four Corners5,562
Hamilton5,451
Orchard Homes5,280
Bigfork5,249
Helena Valley Northwest5,070

Got a call from 406?

A 406 number was originally issued in Montana, but that does not prove the caller is there. 16% of 406 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 754 prefixes in area code 406

Format: (406) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 406

Where is area code 406?
Area code 406 is in Montana. It covers Billings, Missoula, Great Falls, Bozeman, Butte-Silver Bow, Helena and 21 more cities and towns.
What time zone is area code 406?
Area code 406 is in the Mountain time zone.
Is 406 a toll-free number?
No. 406 is a geographic area code in Montana. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 406 run out of numbers?
NANPA's latest forecast projects area code 406 to exhaust in the fourth quarter of 2033. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Montana