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  2. Area codes 815 and 779 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_815_and_779

    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 be dialed with an area code beginning on February 17, 2007. A month later, area code 779 was activated.

  3. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    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.

  4. Area codes 309 and 861 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_309_and_861

    Sometime after September 1956, [1] the 815 numbering plan area was divided roughly in half along a north-westerly to south-easterly running line, assigning area code 309 to its western part. It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708.

  5. Category:Area codes in Illinois - Wikipedia

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

    Pages in category "Area codes in Illinois" The following 12 pages are in this category, out of 12 total. ... Area code 773; Area codes 815 and 779; Area codes 847 and ...

  6. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    The original North American area codes were established by the American Telephone and Telegraph Company ... 815: US:IL: Illinois (northern, except Chicago and Quad ...

  7. McHenry, Illinois - Wikipedia

    en.wikipedia.org/wiki/McHenry,_Illinois

    McHenry is located 46 miles northwest of Chicago in northeastern Illinois on the Fox River. According to the 2020 census, McHenry has a total area of 14.50 square miles (37.55 km 2) [22] McHenry lies within the Fox River Valley, and its downtown area is situated on that river. "The Heart of the Fox River" is the city's motto.

  8. Area code 312 - Wikipedia

    en.wikipedia.org/wiki/Area_code_312

    The Illinois side of the Chicago area–312/773/872, 708/464, 847/224, 630/331 and portions of 815/779–is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied from one portion of the metro area to the other.

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

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

    2 Area codes by country, state, province, and regions. ... 815: Illinois (much of northern Illinois outside Chicago and its immediate surrounding suburbs: ...