Area code 406

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Montana numbering plan area and area code (blue) Area code MT.png
Montana numbering plan area and area code (blue)

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.

Contents

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

Related Research Articles

Ten-digit dialing is a telephone dialing procedure in the countries and territories that are members of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk code 1, which is referred to as 1+10-digit dialing or national format.

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<span class="mw-page-title-main">Area code 775</span> Area code for Nevada, United States

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<span class="mw-page-title-main">Area code 907</span> Area code that serves Alaska, USA

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<span class="mw-page-title-main">Area codes 910 and 472</span> Area code in southeastern North Carolina, United States

Area codes 910 and 472 are telephone area codes in the North American Numbering Plan (NANP) for southeastern North Carolina. The area codes form an overlay for a numbering plan area (NPA) that includes the cities of Wilmington, Jacksonville, Laurinburg, Lumberton and Fayetteville. Area code 910 was established in 1993, and 472 was added to the same area in October 2022.

<span class="mw-page-title-main">Area code 302</span> US telephone area code for Delaware

Area code 302 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Delaware. It is Delaware's only area code, and was assigned in 1947 as one of the original North American area codes.

<span class="mw-page-title-main">Area code 616</span> Area code for Western Michigan

Area code 616 is the telephone area code in the North American Numbering Plan (NANP) for Greater Grand Rapids, Michigan. The numbering plan area also includes the towns of Holland, Greenville, and Grand Haven. This comprises all of Kent and Ottawa counties, and parts of neighboring counties, including the western and central parts of Ionia County. It was one of the original North American area codes created in 1947.

<span class="mw-page-title-main">Area code 530</span> Area code in northern California

Area code 530 is a telephone area code in the North American Numbering Plan (NANP) in northeastern and Northern California. It was created in 1997 in an area code split of 916.

<span class="mw-page-title-main">Area code 505</span> Telephone area code for northwestern New Mexico

Area code 505 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of New Mexico. Its numbering plan area (NPA) comprises the northwestern and central portions of the state, including the Albuquerque metropolitan area, Gallup, Santa Fe, and Farmington. The area code is one of the original North American area codes established in October 1947. Until October 7, 2007, it served the entire state.

<span class="mw-page-title-main">Area code 915</span> Area code in Texas, United States

Area code 915 is a telephone area code in the North American Numbering Plan for the area around El Paso, Texas, U.S. It is one of the original North American area codes established in October 1947, when it was assigned to the north-western part of the state, north of Austin and west of Fort Worth, and stretched from the Oklahoma border to the Mexican border.

<span class="mw-page-title-main">Area code 509</span> Telephone area code for eastern Washington state

Area code 509 is the telephone area code in the North American Numbering Plan (NANP) for the eastern part of the U.S. state of Washington. The numbering plan area (NPA) roughly comprises the state east of the Cascade Mountains, and includes Spokane, the Tri-Cities, Ellensburg, Yakima, Walla Walla, and Wenatchee. The area code was assigned in a split of area code 206 in 1956.

<span class="mw-page-title-main">Area code 660</span> Telephone area code for northern and western Missouri, United States

Area code 660 is the telephone area code in the North American Numbering Plan (NANP) for the northern and western part of the U.S. state of Missouri. It was created on October 12, 1997, in a split of the 816 numbering plan area (NPA)

<span class="mw-page-title-main">Area code 989</span> Area code in Michigan, United States

Area code 989 is a telephone area code in the North American Numbering Plan for Central Michigan, the northeastern Lower Peninsula, and portions of the Thumb. It is the highest-numbered area code in use in the North American Numbering Plan (NANP), as well as the highest possible under the current system, in which a middle digit of 9 is forbidden.

<span class="mw-page-title-main">Area code 605</span> Area code for South Dakota, United States

Area code 605 is the telephone area code in the North American Numbering Plan for the entire U.S. state of South Dakota. The numbering plan area was designated in 1947, when the American Telephone and Telegraph Company (AT&T) devised a comprehensive telephone numbering plan for the United States and Canada.

<span class="mw-page-title-main">Area code 501</span> Area code for central Arkansas

Area code 501 is a telephone area code in the North American Numbering Plan (NANP) for central Arkansas, including Little Rock and most of its suburbs. The numbering plan area (NPA) comprises most communities in Cleburne, Conway, Faulkner, Garland, Hot Spring, Lonoke, Perry, Pulaski, Saline, White and Van Buren counties.

<span class="mw-page-title-main">Area code 620</span> Area code for southern Kansas, United States

Area code 620 covers telephone exchanges in most of southern Kansas. It was created as the result of a split from 316 on February 3, 2001. The area code stretches across the southern half of the state, from the Colorado border in the west to the Missouri border in the east. It completely surrounds 316, which now only serves Wichita and its inner suburbs, making it one of the six pairs of "doughnut area codes" in the numbering plan. Permissive dialing of 316 across southern Kansas continued until November 3, 2001.

<span class="mw-page-title-main">Area code 417</span> Telephone area code for southwestern Missouri, United States

Area code 417 is a telephone area code in the North American Numbering Plan (NANP) for the southwestern quadrant of Missouri, including the cities of Branson, Carl Junction, Carthage, Joplin, Lebanon, Neosho, Nixa, Ozark, Springfield, and West Plains. Area code 417 was created in 1951 as a split from area code 816.

References

  1. Inbody, Kristen (27 Nov 2017). "In Montana, it's 406 exclusively until 2031". Great Falls Tribune. www.greatfallstribune.com. Retrieved 13 June 2023.
  2. "Montana PSC Granted Authority to Implement Mandatory Number Pooling". fcc.gov. 12 December 2015. Archived from the original on 10 December 2017. Retrieved 7 May 2018.
  3. "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.
  4. North Parkman is served from wire centre DNRHWYMARS1 Archived 2014-10-19 at the Wayback Machine in Sheridan, WY
  5. Ridge is served from HLTTWYXCRS1 Archived 2014-10-19 at the Wayback Machine Hulett, WY
  6. Silvertip is served from POWLWYMARS1 Archived 2014-10-19 at the Wayback Machine Powell, WY
  7. West Beach is served from BECHNDXADS1 Archived 2014-10-19 at the Wayback Machine in Beach, ND
  8. West Camp Crook is served from CMCRSDXARL0 Archived 2014-10-19 at the Wayback Machine in Camp Crook, SD
  9. West Squaw Gap is served from SQGPNDXARS5 Archived 2014-10-19 at the Wayback Machine Squaw Gap, ND
Montana area codes: 406
North: 236/672/778, 250, 306, 403, 587/825/368, 639
West: 208/986 406East: 605, 701
South: 307
Alberta area codes: 403, 587/825/368, 780
British Columbia area codes: 236/672/778, 250, 604
Saskatchewan area codes: 306, 639
Idaho area codes: 208/986
North Dakota area codes: 701
South Dakota area codes: 605
Wyoming area codes: 307