Where Is Area Code 406?
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 |
Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.
View all United States Area Codes.
This page was last updated on July 3, 2015.