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  2. Area codes 815 and 779 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_815_and_779

    Area code 309 was created by merging the western part of 815, including the Illinois side of the Quad Cities, with the northern portion of area code 217. 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.

  3. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    In 1957, area code 815 was split for the assignment of area code 309 to western central Illinois. No further changes took place for 33 years. 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 ...

  4. Area code 815 - Wikipedia

    en.wikipedia.org/?title=Area_code_815&redirect=no

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  5. Rockford, Illinois - Wikipedia

    en.wikipedia.org/wiki/Rockford,_Illinois

    FIPS code. 17-65000. Website. rockfordil.gov. [9] Rockford is a city in Winnebago County, Illinois, United States. Located in far northern Illinois on the banks of the Rock River, Rockford is the county seat of Winnebago County (with a small portion of the city located in Ogle County). The population was 148,655 at the 2020 census, making ...

  6. Area codes 309 and 861 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_309_and_861

    The northern NPA was assigned area code 815 in the group of eighty-six original North American area codes. 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.

  7. DeKalb, Illinois - Wikipedia

    en.wikipedia.org/wiki/DeKalb,_Illinois

    Area code: 815: FIPS code: 17-19161: Public Transit: ... Northern Illinois University (NIU) was founded in DeKalb as the Northern Illinois State Normal School in 1895 ...

  8. Will County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Will_County,_Illinois

    Will County is one of the five collar counties of the Chicago–Naperville–Elgin, IL–IN–WI Metropolitan Statistical Area. The portion of Will County around Joliet uses area codes 815 and 779, while 630 and 331 are for far northern Will County and 708 is for central and eastern Will County.

  9. Area code 312 - Wikipedia

    en.wikipedia.org/wiki/Area_code_312

    Area code 312 originally served almost all of the Illinois side of the Chicago metropolitan area. The major exceptions were portions of Grundy, Kane, Kankakee, McHenry, and Will counties, which were located in the numbering plan area of the rest of northern Illinois, 815.