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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    Area code 847 exhausted its numbers quickly, so that an overlay area code, 224, was implemented in 1996 for relief. However, mandatory ten-digit dialing was not in effect until 2002. In March 2007, an overlay plan was created for NPA 630 adding area code 331, and 779 was added to 815. With the depletion of new numbers in area codes 312 and 773 ...

  3. Area codes 847 and 224 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_847_and_224

    Area code 847 was created on January 20, 1996, in a three-way split of area code 708. Area code 847 was involved in the first trial of telephone number pooling in the United States in June 1998, to avert central office code exhaustion in the numbering plan area. [ 1 ]

  4. List of Michigan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Michigan_area_codes

    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 in the first split of 616. 1993: Area code 810 was created in the first split of 313. 1997: Area code 734 was created in the second split of 313. and area code 248 was created in the first split of 810 ...

  5. List of Ohio area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Ohio_area_codes

    The first nationwide telephone numbering plan of 1947 divided Ohio into four numbering plan areas (NPAs), one each for a quadrant of the state: 216, 419, 513, and 614. In 1996, 330 and 937 were added by splitting existing NPAs. In 1997, 440 and 740 were added in additional area code splits. In 2000, 234, and in 2002, 567 were added as overlays ...

  6. Area codes 330 and 234 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_330_and_234

    Area codes 330 and 234 are telephone area codes in the North American Numbering Plan (NANP) for a part of northeast Ohio. The numbering plan area (NPA) includes the cities of Akron, Canton, Youngstown, and Warren. Area code 330 was established on March 9, 1996 in an area code split of area code 216. It was Ohio's first new area code since the ...

  7. Area codes 870 and 327 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_870_and_327

    Area codes 870 and 327 are telephone area codes in the North American Numbering Plan (NANP) for southern, eastern, and most of northern Arkansas. 870 was created on April 14, 1997, in a split from area code 501, Arkansas's original area code of 1947, and 327 was added as part of an overlay complex in 2024.

  8. Area code 228 - Wikipedia

    en.wikipedia.org/wiki/Area_code_228

    Area code 228 is the telephone area code in the North American Numbering Plan (NANP) for the Gulf Coast in the U.S. state of Mississippi, serving the three counties in the state's southeastern tip: Hancock, Harrison, and Jackson. It was the second area code created in the state, when in 1997, the numbering plan area was split from the original ...

  9. Area codes 716 and 624 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_716_and_624

    Area codes in New York state with the area codes 716 and 624 highlighted in red. Area codes 716 and 624 are telephone area codes in the North American Numbering Plan (NANP) for Buffalo, Niagara Falls, and four surrounding counties in western New York. 716 was one of the original North American area codes established in 1947, while 624 was assigned to the identical numbering plan area (NPA) in ...