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2. List of Illinois area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Illinois_area_codes

   This is a list of the area codes in the state of Illinois and its numbering plan areas in the North American Numbering Plan.. All NPAs within Illinois. 217/447: Central Illinois, including the region running west from the Illinois-Indiana border through Danville, Effingham, Champaign–Urbana, Decatur, Springfield, Quincy until Illinois' western border with Missouri and Iowa

3. Category:Area codes in Illinois - Wikipedia

   en.wikipedia.org/.../Category:Area_codes_in_Illinois

   Print/export Download as PDF; Printable version; In other projects Wikidata item; ... List of Illinois area codes; 0–9. Area codes 217 and 447; Area codes 309 and 861;

4. 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 ...

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

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

   Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.

6. Area codes 217 and 447 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_217_and_447

   In 2006, the Illinois Commerce Commission approved an all-services overlay for the numbering plan area, adding new area code 447 in 2021. [ 3 ] [ 4 ] As of March 27, 2021, new central office codes are available for activation by service providers.

7. 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 ...