MONTANA · AREA CODE GUIDE
406 area code location: Billings and Missoula, Montana
- Local date and time
- Mountain Time
Map data: HSIP (2010) · NANPA · Statistics Canada (Open Government Licence – Canada) · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 406 area code map
A printable area code 406 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
406 area code at a glance
- State
- Montana
- Primary cities
- Billings, Missoula, and Great Falls
- Established
- Population
- Largest community: Billings, 121,239 (2025)Not an area-code population.
- Prefixes in service
- 754 as of 13 October 2026
An area code does not show where a caller is now.
History
Country and calling code: United States (+1).
New code planned: No, as of 22 September 2026.
Time zone
- Mountain Time
- Standard time UTC−07:00
- Daylight saving time UTC−06:00
Counties and cities covered
406 numbers are issued across 260 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
Counties of the communities we could place (the code may reach further): Fergus County, Gallatin County, Roosevelt County, Cascade County, Madison County, Sheridan County, Valley County, Carbon County, Chouteau County, Flathead County, Lake County, Lincoln County, Phillips County, Ravalli County, Sanders County, Teton County, Yellowstone County, Beaverhead County, Big Horn County, Blaine County, Daniels County, Dawson County, Fallon County, Golden Valley County, Granite County, Hill County, Jefferson County, Judith Basin County, Mineral County, Musselshell County, Park County, Pondera County, Richland County, Rosebud County, Toole County, Wheatland County, Broadwater County, Carter County, Custer County, Garfield County, Glacier County, Lewis and Clark County, Liberty County, McCone County, Meagher County, Missoula County, Petroleum County, Powder River County, Powell County, Prairie County, Silver Bow County, Stillwater County, Sweet Grass County, Treasure County, and Wibaux County.
- Billings
- Missoula
- Great Falls
- Bozeman
- Butte
- Helena
- Kalispell
- Belgrade
- Whitefish
- Livingston
- Havre
- Miles City
- Laurel
- Sidney
- Lewistown
- Columbia Falls
- Polson
- Hamilton
- Glendive
- Dillon
- Hardin
- Shelby
- Libby
- Glasgow
- Deer Lodge
235 more communities
- Cut Bank
- Red Lodge
- Wolf Point
- Conrad
- Townsend
- Stevensville
- Ronan
- Colstrip
- Roundup
- Manhattan
- Columbus
- Three Forks
- Malta
- Choteau
- Baker
- Big Timber
- Forsyth
- Plentywood
- Eureka
- Thompson Falls
- Fort Benton
- Boulder
- Plains
- West Yellowstone
- Chinook
- Whitehall
- Ennis
- White Sulphur Springs
- Harlowton
- Scobey
- Superior
- Philipsburg
- Troy
- Darby
- Fairview
- Chester
- Saint Ignatius
- Fairfield
- Sheridan
- Harlem
- Poplar
- Culbertson
- Hot Springs
- Joliet
- Big Sandy
- Circle
- Cascade
- Terry
- Alberton
- Valier
- Belt
- Broadus
- Wibaux
- Twin Bridges
- Stanford
- Fromberg
- Lodge Grass
- Ekalaka
- Sunburst
- Clyde Park
- Jordan
- Dutton
- Drummond
- Nashua
- Bainville
- Hysham
- Virginia City
- Medicine Lake
- Fort Peck
- Ryegate
- Lima
- Denton
- Winnett
- Geraldine
- Moore
- Hobson
- Froid
- Winifred
- Plevna
- Westby
- Richey
- Saco
- Melstone
- Lavina
- Broadview
- Hingham
- Dodson
- Grass Range
- Judith Gap
- Outlook
- Opheim
- Flaxville
- Neihart
- Absarokee
- Alta
- Alzada
- Anaconda
- Arlee
- Ashland
- Augusta
- Avon
- Belfry
- Big Sky
- Bigfork
- Birney
- Bloomfield
- Box Elder
- Brady
- Bridger
- Brockton
- Browning
- Busby
- Canyon Creek
- Carlyle
- Carter
- Charlo
- Clinton
- Condon
- Cooke City
- Crooked Creek
- Custer
- Dagmar
- Decker
- Devon
- Divide
- Dixon
- Dupuyer
- East Conrad
- East Glacier Park
- Elmo
- Ethridge
- Eureka Rural
- Fallon
- Finley Point
- Flaxville Rural
- Fort Shaw
- Fort Smith
- Frazer
- Frenchtown
- Froid Rural
- Gallatin Gateway
- Gardiner
- Geyser
- Gildford
- Glentana
- Grant
- Harrison
- Haugan
- Hays
- Highwood
- Hinsdale
- Hopp Illiad
- Hungry Horse
- Huntley
- Jackson
- Joplin
- Kevin Oilmont
- Kremlin
- Lakeside
- Lambert
- Lame Deer
- Larslan
- Lincoln
- Lindsay
- Loma
- Marion
- Martinsdale
- Melrose
- Melville
- Molt
- Musselshell
- North Broadus
- North Cut Bank
- North Frannie
- North Glasgow
- North Havre
- North Hinsdale
- North Nashua
- North Parkman
- North Poplar
- North Ryegate
- North Wolf Point
- Noxon
- Olney
- Ovando
- Pablo
- Peerless
- Pendroy
- Pompeys Pillar
- Potomac
- Power
- Rapelje
- Raynesford
- Reedpoint
- Reserve
- Ridge
- Rock Springs
- Rosebud
- Roy
- Rudyard
- Saint Mary
- Saint Regis
- Savage
- Scobey Rural
- Seeley Lake
- Silvertip
- Somers
- South Alberton
- South Broadus
- South Chester
- South Havre
- South Malta
- South Miles City
- South Wolf Point
- Stockett
- Swan Lake
- Sweet Grass
- Turner
- Valley Industrial Park
- Victor
- Warm Springs
- West Beach
- West Camp Crook
- West Glacier
- West Glendive
- West Sidney
- West Squaw Gap
- Whitewater
- Wilsall
- Wisdom
- Wise River
- Wolf Creek
- Worden
- Wyola
- Yellow Bay
Notable places in 406
| Place | Where | What it is |
|---|---|---|
| Glacier National Park | 27.3 km from Saint Mary | National Park |
| Montana State University | 1.8 km from Bozeman | University, 18,998 12-month enrollment (2023–24) |
| University of Montana | 3.5 km from Missoula | University, 12,702 12-month enrollment (2023–24) |
| Malmstrom Air Force Base | 7.1 km from Great Falls | Military base |
| Bozeman Yellowstone International Airport | 2.1 km from Belgrade | Commercial airport, 1,321,790 enplanements (2024) |
| Billings Logan International Airport | 2.3 km from Billings | Commercial airport, 475,334 enplanements (2024) |
| Great Falls International Airport | 5.7 km from Great Falls | Commercial airport, 186,778 enplanements (2024) |
| Museum of the Rockies | 2.2 km from Bozeman | Museum |
| ZooMontana | 8.4 km from Billings | Zoo |
| Little Bighorn Battlefield National Monument | 23.8 km from Hardin | National Monument |
Questions about 406
Where is the 406 area code?
406 is in Montana. Its numbers are issued in Billings, Missoula, Great Falls, and 257 other communities.
What time zone is area code 406 in?
406 is in Mountain Time. Daylight saving time is observed.
What cities are in the 406 area code?
Billings, Missoula, Great Falls, Bozeman, and Butte, and 255 other communities.
What state is area code 406 in?
Area code 406 is in Montana.
What counties are covered by area code 406?
Area code 406 covers communities in Fergus County, Gallatin County, Roosevelt County, Cascade County, Madison County, Sheridan County, Valley County, Carbon County, Chouteau County, Flathead County, Lake County, Lincoln County, Phillips County, Ravalli County, Sanders County, Teton County, Yellowstone County, Beaverhead County, Big Horn County, Blaine County, Daniels County, Dawson County, Fallon County, Golden Valley County, Granite County, Hill County, Jefferson County, Judith Basin County, Mineral County, Musselshell County, Park County, Pondera County, Richland County, Rosebud County, Toole County, Wheatland County, Broadwater County, Carter County, Custer County, Garfield County, Glacier County, Lewis and Clark County, Liberty County, McCone County, Meagher County, Missoula County, Petroleum County, Powder River County, Powell County, Prairie County, Silver Bow County, Stillwater County, Sweet Grass County, Treasure County, and Wibaux County.
Is 406 a toll-free area code?
No. 406 is a geographic area code. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.
Sources: NANPA area code listing, NANPA places by area code, NANPA central office code assignments, U.S. Census Bureau population estimates, OMB metropolitan area delineations. Checked .
Business phone numbers in area code 406, answered by an AI agent
A local number for Billings, Missoula, and Great Falls, Montana, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.