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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.
406: Montana (all) 1947: 407: Florida ... area code 387 is reserved as a fifth code for the region; 648: not in use; available for geographic assignment 649: The ...
For convenience, all U.S. area codes should be included in this category. This includes all area codes that can also be found in the subcategories. ... Area code 406 ...
Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American ... 406 Bow: Merrimack: December 21, 2018 407 Belmont: Belknap: May 6 ...
Numbering plan areas and area codes since May 2001 September 1997 [1] – May 2001 [2] July 1988 [3] – September 1997 [4] [5] October 1947 – July 1988 [6]. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [7] organized as four overlay complexes and a single-area code NPA.
Area code 408 was split from area code 415 in 1959. The numbering plan area was reduced in geographic extent in 1998 for the creation of area code 831. In 2012, area code 669 was assigned as a second area code for same numbering plan area by overlay.
Area code 606 is a telephone area code serving the eastern half of south-central and all of the eastern part ... 406 Corbin: Whitley: 40701 April 19, 2022 407 ...
Area code 440 was established on August 16, 1997, in a three-way split of area code 216, one of the original North American area codes, [1] to provide relief from central office prefix exhaustion from increasing popularity of cellular phones and population pressure. [2]