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  2. 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 10 October 2024. "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 ...

  3. 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 ...

  4. 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 ...

  5. 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.

  6. List of Illinois townships - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_townships

    Local government in the Illinois Territory, and the state of Illinois after 1818 statehood, was predominantly handled by the state's counties, although towns and villages also existed. Chicago was chartered as the state's first city in 1837.

  7. List of Illinois locations by per capita income - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_locations...

    Rank County Per capita income Median household income Median family income Population Number of households 1 Lake: $38,120 $78,948 $91,693 703,462 241,712

  8. 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 ...

  9. 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.