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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    Area codes 847 (northern suburbs) and 630 (western suburbs) were created from a split of suburban area code 708 in 1996. Shortly after in 1996, area code 773 was created for the residential parts of the city of Chicago, while downtown kept area code 312. Area code 847 exhausted its numbers quickly, so that an overlay area code, 224, was ...

  3. Rockford, Illinois - Wikipedia

    en.wikipedia.org/wiki/Rockford,_Illinois

    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 Rockford the fifth-most populous city in Illinois, as well as the state's most populous city outside of the Chicago ...

  4. Northern Illinois - Wikipedia

    en.wikipedia.org/wiki/Northern_Illinois

    Northern Illinois University (NIU), in DeKalb, is located at the heart of Northern Illinois and is the state's second largest institute of higher education.According to the Regional History Center at NIU, their area of service to the northern portion of Illinois includes the 18 northernmost counties, excluding Cook, Grundy, Kankakee, Mercer and Rock Island Counties, [3] which are covered by ...

  5. DeKalb, Illinois - Wikipedia

    en.wikipedia.org/wiki/DeKalb,_Illinois

    ZIP codes: 60115. Area code: 815: FIPS code: 17-19161: Public Transit: ... (NIU) was founded in DeKalb as the Northern Illinois State Normal School in 1895. NIU is a ...

  6. File:Map of Illinois highlighting Northern Illinois.svg

    en.wikipedia.org/wiki/File:Map_of_Illinois...

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  7. List of municipalities in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_municipalities_in...

    This is an accepted version of this page This is the latest accepted revision, reviewed on 25 January 2025. "Cities in Illinois" redirects here. For unincorporated communities, see List of unincorporated communities in Illinois. For CDPs, see List of census-designated places in Illinois. Map of the United States with Illinois highlighted Illinois is a state located in the Midwestern United ...

  8. North Shore (Chicago) - Wikipedia

    en.wikipedia.org/wiki/North_Shore_(Chicago)

    Many credit Walter S. Gurnee as the father of the North Shore. [1] One of the earliest known monographs to be devoted to the North Shore, The Book of the North Shore (1910), and its companion volume, The Second Book of the North Shore (1911), were written by Marian A. White, whose husband J. Harrison White had established a weekly newspaper in Rogers Park in 1895 called the North Shore ...

  9. List of counties in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Illinois

    Illinois's FIPS state code is 17 and its postal abbreviation is IL. What is now Illinois was claimed as part of Illinois County, Virginia, between 1778 and 1782. Modern-day county formation dates to 1790 when the area was part of the Northwest Territory; two counties—St. Clair and Knox—were created at that time.