Area code 406 explained

Image:Area_code_MT.png|right|thumb|Montana numbering plan area and area code (blue)poly 67 33 0 20 1 1 51 0 58 24 Area code 250poly 66 33 57 25 52 0 198 0 198 54 Area code 403poly 198 55 198 0 419 0 418 72 265 63 Area code 306poly 373 71 419 71 419 212 364 210 Area code 701poly 364 212 363 267 419 267 419 212 Area code 605poly 140 233 133 268 363 269 362 255 Area code 307poly 1 21 15 23 6 70 12 85 12 99 37 137 47 141 36 165 39 178 31 179 32 187 35 195 51 188 58 216 65 222 60 221 61 230 71 230 71 248 77 254 79 247 92 253 93 246 110 250 121 250 125 243 130 256 135 259 134 268 1 267 Area codes 208 and 986desc top-right

Area code 406 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Montana. It has been Montana's only area code since the American Telephone and Telegraph Company created a nationwide telephone numbering plan 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 2031; number pooling has been implemented in response to increased demand and inefficient use of 406 numbering resources.[1] [2]

Prior to October 2021, area code 406 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.[3]

Service area

The service area includes the following communities and their central office codes.

See also

References

  1. Web site: Inbody . Kristen . In Montana, it's 406 exclusively until 2031 . Great Falls Tribune . www.greatfallstribune.com . 13 June 2023 . "In Montana, it's 406 exclusively until 2031" . 27 Nov 2017.
  2. Web site: Montana PSC Granted Authority to Implement Mandatory Number Pooling. 12 December 2015. fcc.gov. 7 May 2018. live. https://web.archive.org/web/20171210160211/https://www.fcc.gov/document/montana-psc-granted-authority-implement-mandatory-number-pooling. 10 December 2017.
  3. Web site: Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline). January 8, 2021. North American Numbering Plan Administrator . March 9, 2021.
  4. North Parkman is served from wire centre DNRHWYMARS1 in Sheridan, WY
  5. Ridge is served from HLTTWYXCRS1 Hulett, WY
  6. Silvertip is served from POWLWYMARS1 Powell, WY
  7. West Beach is served from BECHNDXADS1 in Beach, ND
  8. West Camp Crook is served from CMCRSDXARL0 in Camp Crook, SD
  9. West Squaw Gap is served from SQGPNDXARS5 Squaw Gap, ND

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