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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the northern part of Illinois, 708, eventually received such with area code 464 taking effect on January 21 ...

  3. Area codes 618 and 730 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_618_and_730

    The numbering plan areas and area codes of Illinois. Area codes 618 and 730 are telephone area codes in the North American Numbering Plan (NANP) for southern Illinois.The numbering plan area (NPA) comprises one hundred and twenty-six municipalities, such as Carbondale, Cairo, Belleville, East St. Louis, Edwardsville, Marion, O'Fallon, Alton, Mt. Vernon, Centralia, Herrin, Salem, Metropolis ...

  4. Area codes 815 and 779 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_815_and_779

    All NPAs within Illinois. Area codes 815 and 779 are telephone area codes in the North American Numbering Plan (NANP) for most of northern Illinois outside the Chicago and Quad Cities areas. It also serves the Joliet area and some of Chicago’s western and northwestern exurbs. 815 was one of the four original Illinois area codes set up in 1947.

  5. Area code 312 - Wikipedia

    en.wikipedia.org/wiki/Area_code_312

    Area code 312. Coordinates: 41°52′48″N 87°37′54″W. All NPAs within Illinois. Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs. The numbering plan area is completely surrounded by area code 773, which serves the rest of ...

  6. Area codes 309 and 861 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_309_and_861

    It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708. On October 24, 2021, area code 309 was transitioned to ten-digit dialing, despite not being part of an overlay complex, in which multiple area codes are assigned to a numbering plan area. The area code had telephone numbers assigned for the ...

  7. Area codes 630 and 331 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_630_and_331

    Coordinates: 41°50′N 88°06′W. All NPAs within Illinois. Area codes 630 and 331 are telephone area codes in the North American Numbering Plan (NANP) for portions of Chicago 's near and far western suburbs, including the majority of DuPage County, Illinois. To the northwest, the numbering plan area (NPA) also includes a small portion of ...

  8. Area codes 847 and 224 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_847_and_224

    Coordinates: 42°09′46″N 87°53′15″W. NPA codes of Illinois. Area codes 847 and 224 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Illinois. The numbering plan area (NPA) comprises the northeastern part of Illinois and many northern suburbs of Chicago. This includes most of Lake County, the ...

  9. Area codes 708 and 464 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_708_and_464

    Area codes 708 and 464 are telephone area codes in the North American Numbering Plan (NANP) for the southern and western suburbs of Chicago in the U.S. state of Illinois. The numbering plan area comprises most of western and southern Cook County, and eastern and southern Will County . Area code 708 was created on November 11, 1989, in a split ...

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