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The original North American area codes were established by the American Telephone and ... for its Chicago suburbs by dividing area code 317. [22] In ...
In the group of original North American area codes, established in 1947, all of the Chicago metropolitan area was part of numbering plan area 312, the rest of northern Illinois was 815, central Illinois was 217, and southern Illinois was 618. In 1957, area code 815 was split for the assignment of area code 309 to western central Illinois.
The North American Numbering Plan (NANP) divides the territories of its members into 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 that are prefixed to each local telephone number having seven digits.
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes
In 1995, the North American Numbering Plan Administrator eliminated the requirement that the middle digit of an area code had to be either 0 or 1, implementing fully interchangeable NPA and central office codes, that had already been anticipated since the 1960s, when interchangeable central office codes were sanctioned.
Area codes 815 and 779 are telephone area codes in the North American Numbering Plan (NANP) for most of northern Illinois outside the Quad Cities areas. It also serves the Joliet area and some of Chicago’s western and northwestern suburbs. 815 was one of the four original Illinois area codes set up in 1947.
In addition to being the sole area code in the Space Coast region around the Kennedy Space Center, this is the only partial overlay area code in North America 323: 213: Central Los Angeles, incl. Downtown L.A. and Hollywood: 326: 937: Southwest Ohio: 331: 630: Western suburbs of Chicago: 332, 646 , 917: 212
The northern suburbs received area code 847, while the western suburbs were assigned area code 630. Area code 708 was Illinois' first new area code since 309 had been created in 1957, and the second new code for the state since the announcement of the original North American area codes in 1947, when the state was divided into four numbering ...