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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    In 1989, area code 708 was created for all of the suburbs in the Chicago metropolitan area while the city of Chicago kept the original 312. Area codes 847 (northern suburbs) and 630 (western suburbs) were created from a split of suburban area code 708 in 1996. Shortly after in 1996, area code 773 was created for the residential parts of the ...

  3. List of area code overlays - Wikipedia

    en.wikipedia.org/wiki/List_of_area_code_overlays

    St. Louis, Missouri (communities such as, but not limited to, St. Louis, Overland, Bridgeton, Florissant, Webster Groves, Creve Coeur, Kirkwood and Sappington) Initial overlay area code plan was announced October 24, 2000. New 557 area code was announced in February 2022 and went into effect August 12, 2022.

  4. List of future North American area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_future_North...

    This is a list of future area codes in the North American Numbering Plan (NANP) that are in the planning stages for relief of central office code exhaustion in the given numbering plan areas (NPAs). The dates are subject to change during implementation as published in the official NANP Administrator Planning Letters.

  5. List of Missouri area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Missouri_area_codes

    This is a list of telephone area codes in the state of Missouri. The area codes are allocated within the North American Numbering Plan (NANP). The two original area codes for Missouri in 1947 were 314 and 816. Area code 417 was split off from 816 in 1950, and the other area codes followed more than 40 years later, due to the proliferation of ...

  6. Area codes 708 and 464 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_708_and_464

    Area code 708 was created on November 11, 1989, in a split of area code 312. It once served almost all of Chicago's suburbs in Illinois. In 1996, its numbering plan area was reduced in a three-way area code split. The northern suburbs received area code 847, while the western suburbs were assigned area code 630.

  7. North American Numbering Plan expansion - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering...

    A 9 would be inserted as the new second digit of all area codes (e.g. 212 would become 2912, 916 would become 9916). Permissive dialing would be allowed because exchange equipment, on detecting a 9 as the second digit of the area code, would respond appropriately to expect 11 digits, or 10 in the absence of a 9 in that position.

  8. Area codes 815 and 779 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_815_and_779

    The new area code was one of the first area codes not serving an entire state, but having the digit 0 in the middle position of the code. It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708. [2] In preparation of an overlay plan with the new area code 779, all calls from the 815 area needed to ...

  9. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    2023: returned to the pool of area codes available for future area code relief; 457: Louisiana (Shreveport–Bossier City, Monroe, Alexandria, Fisher, Tallulah, and most of northern Louisiana) September 25, 2025 [3] to be overlaid on 318; previously a fictitious area code assigned to identify Naked DSL/Dry Loop and dedicated data lines in ...