Where Is Area Code 406?

Map of Montana with area code 406 highlighted — Location of Area Code 406 and surrounding states.

Area code 406 is found in the US state of Montana. Servicing the entire state, area code 406 includes the city of Billings (population: 131508), and all 56 counties of Montana.

Located in the Mountain time zone, area code 406 is on the same time as Phoenix, AZ.

Area code 406 was brought into effect on January 1, 1947.

Counties in Area Code 406

Beaverhead,
Big Horn,
Blaine,
Broadwater,
Carbon,
Cascade,
Chouteau,
Custer,
Daniels,
Dawson,
Deer Lodge,
Fallon,
Fergus,
Flathead,
Gallatin,
Glacier,
Granite,
Hill,
Jefferson,
Lake,
Lewis and Clark,
Liberty,
Lincoln,
Madison,
McCone,
Meagher,
Mineral,
Missoula,
Musselshell,
Park,
Phillips,
Pondera,
Powder River,
Powell,
Ravalli,
Richland,
Roosevelt,
Rosebud,
Sanders,
Sheridan,
Silver Bow,
Stillwater,
Sweet Grass,
Teton,
Toole,
Valley,
Wheatland,
Wibaux,
Yellowstone.

Most Populous Cities in Area Code 406

City	County	City Population	Time Zone
Billings	Yellowstone	131,508	MST
Missoula	Missoula	92,381	MST
Great Falls	Cascade	72,430	MST
Bozeman	Gallatin	60,973	MST
Helena	Lewis and Clark	54,818	MST
Kalispell	Flathead	50,078	MST
Butte	Silver Bow	33,695	MST
Belgrade	Gallatin	18,811	MST
Columbia Falls	Flathead	13,603	MST
Hamilton	Ravalli	13,183	MST
Havre	Hill	12,849	MST
Whitefish	Flathead	12,685	MST
Livingston	Park	11,827	MST
Miles City	Custer	11,588	MST
Laurel	Yellowstone	11,253	MST
Polson	Lake	9,995	MST
Libby	Lincoln	9,757	MST
Stevensville	Ravalli	9,713	MST
Lewistown	Fergus	8,986	MST
Anaconda	Deer Lodge	8,870	MST
Glendive	Dawson	8,567	MST
Sidney	Richland	8,158	MST
Dillon	Beaverhead	8,049	MST
Browning	Glacier	7,898	MST
Bigfork	Flathead	7,739	MST