Area code 906 is the telephone area code in the North American Numbering Plan (NANP) for the Upper Peninsula of Michigan. Area code 906 was formed in...

twelve: 1947: Area codes 313, 517 and 616 are three of the original 86 area codes in the North American Numbering Plan. 1961: Area code 906 was created...

geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits...

serve an entire state. In 1961, the Upper Peninsula was split off with area code 906. This configuration remained in place for 38 years. In 1999, the northwestern...

Area codes 905, 289, 365, and 742 are telephone area codes in the North American Numbering Plan (NANP) for the Golden Horseshoe region that surrounds Lake...

Area codes 778, 236, and 672 are telephone area codes in the North American Numbering Plan (NANP) for the Canadian province of British Columbia. They...

uses 231, while the rest uses 906. Planning letter 167, which details 231's creation (PDF) Map of Michigan area codes at North American Numbering Plan...

Area codes 519, 226, 548, and 382 are overlay telephone area codes in the North American Numbering Plan (NANP) for most of southwestern Ontario. Area...

Area codes 617 and 857 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Massachusetts, serving the city of Boston...

Area code 613 is one of the 86 original North American area codes assigned in October 1947. Area code 343 was assigned to the numbering plan area in...