Area code 406

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Lua error in Module:Coordinates at line 668: callParserFunction: function "#coordinates" was not found.[1] Area code 406 is the telephone area code covering the entire state of Montana. It has been Montana's area code since area codes were created in 1947.

As of 2013, there were 1.7 million lines served by 47 carriers; all but two wireline providers support local number portability (the exceptions are small rural independents Hot Springs Telephone Company and Northern Telephone Cooperative). Sufficient available codes for new exchanges in the 406 area code exist to meet anticipated demand until 2019; number pooling has been implemented in response to increased demand and inefficient use of 406 numbering resources.[2]

Exchanges in area code 406

Use by Google

On December 10, 2008, Google's Gmail Blog announced that SMS messages could be sent from inside Gmail. The messages are sent from numbers in the 406 area code. Each number is unique and can be bookmarked in your phone for replies or future use.[9]

Google also employs the use of area code 406 for the assignment of reply-to or callback numbers for Google Voice's customers' contacts.


  1. "State of Montana". Geographic Names Information System. United States Geological Survey.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. North Parkman is served from wire centre DNRHWYMARS1 in Sheridan, WY
  4. Ridge is served from HLTTWYXCRS1 Hulett, WY
  5. Silvertip is served from POWLWYMARS1 Powell, WY
  6. West Beach is served from BECHNDXADS1 in Beach, ND
  7. West Camp Crook is served from CMCRSDXARL0 in Camp Crook, SD
  8. West Squaw Gap is served from SQGPNDXARS5 Squaw Gap, ND
  9. Official GMail Blog (10 December 2008). "Really new in Labs this time: SMS Text Messaging for chat". Archived from the original on 4 March 2011. Retrieved 5 March 2011. Unknown parameter |deadurl= ignored (help)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

See also

Montana area codes: 406
North: 403/587/825, 250/778/236, 306/639
West: 208 406 East: 605, 701
South: 208, 307
Alberta area codes: 403, 587, 780, 825
British Columbia area codes: 236, 250, 604, 778
Saskatchewan area codes: 306, 639
Idaho area codes: 208
North Dakota area codes: 701
South Dakota area codes: 605
Wyoming area codes: 307