Area Code 406
406 area code is being used for dialing/telecommunication purposes in Montana, covering 7 major cities and 57 counties, according to (NANP) North American Numbering Plan for 3-digit Numbering Plan Area (NPA) code. All the areas using NPA code 406 is part of MST (Mountain Standard Time) timezone.
406 Area Code Covers 7 Cities
Check this below table to know 7 major cities (having more than 20,000 population) in Montana using numbering plan area code 406 for dialing/telecommunication purposes.
| City | ZIP Codes | Population |
|---|---|---|
| Billings, MT | 14 | 117,093 |
| Bozeman, MT | 6 | 53,500 |
| Great Falls, MT | 6 | 60,373 |
| Helena, MT | 6 | 32,529 |
| Kalispell, MT | 3 | 25,473 |
| Missoula, MT | 8 | 74,627 |
57 Counties Using 406 as Area Code
406 area code is being used in 57 counties of Montana for dialing/telecommunication purposes.
- Beaverhead County, MT
- Big Horn County, MT
- Blaine County, MT
- Broadwater County, MT
- Carbon County, MT
- Carter County, MT
- Cascade County, MT
- Chouteau County, MT
- Custer County, MT
- Daniels County, MT
- Dawson County, MT
- Deer Lodge County, MT
- Fallon County, MT
- Fergus County, MT
- Flathead County, MT
- Gallatin County, MT
- Garfield County, MT
- Glacier County, MT
- Golden Valley County, MT
- Granite County, MT
- Hill County, MT
- Jefferson County, MT
- Judith Basin County, MT
- Lake County, MT
- Lewis and Clark County, MT
- Liberty County, MT
- Lincoln County, MT
- McCone County, MT
- Madison County, MT
- Meagher County, MT
- Mineral County, MT
- Missoula County, MT
- Musselshell County, MT
- Park County, MT
- Petroleum County, MT
- Phillips County, MT
- Pondera County, MT
- Powder River County, MT
- Powell County, MT
- Prairie County, MT
- Ravalli County, MT
- Richland County, MT
- Roosevelt County, MT
- Rosebud County, MT
- Sanders County, MT
- Sheridan County, MT
- Silver Bow County, MT
- Stillwater County, MT
- Sweet Grass County, MT
- Teton County, MT
- Toole County, MT
- Treasure County, MT
- Valley County, MT
- Wheatland County, MT
- Wibaux County, MT
- Yellowstone County, MT
5 More NPA Codes Related to Area Code 406
1 or more of these 5 NPA codes are being used in the same or adjacent states of Montana in the United States.