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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 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 ...

  3. List of counties in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Illinois

    There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.

  4. History of Illinois - Wikipedia

    en.wikipedia.org/wiki/History_of_Illinois

    The city, situated on a prominent bend along the Mississippi River, quickly grew to 12,000 inhabitants and was for a time rivaling for the title of largest city in Illinois. By the early 1840s, the Latter Day Saints built a large stone temple in Nauvoo , one of the largest buildings in Illinois at the time, which was completed in 1846.

  5. Illinois - Wikipedia

    en.wikipedia.org/wiki/Illinois

    The city of Rockford, Illinois's third-largest city and center of the state's fourth largest metropolitan area, sits along Interstates 39 and 90 some 75 mi (121 km) northwest of Chicago. The Quad Cities region, located along the Mississippi River in northern Illinois, had a population of 381,342 in 2011.

  6. Effingham, Illinois - Wikipedia

    en.wikipedia.org/wiki/Effingham,_Illinois

    Effingham is a city in and the county seat of Effingham County, Illinois, United States.It is in South Central Illinois.Its population was 12,252 at the 2020 census. The city is part of the Effingham, IL Micropolitan Statistical Area.

  7. Effingham County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Effingham_County,_Illinois

    Effingham County is a county located in the south central part of the U.S. state Illinois. As of the 2020 census, the population was 34,668. [1] Its county seat and largest city is Effingham. Some other cities in Effingham County, Illinois include Altamont, Teutopolis, Beecher City, Montrose, Dieterich, Shumway, Watson, Mason, and Edgewood ...

  8. DeKalb County, Illinois - Wikipedia

    en.wikipedia.org/wiki/DeKalb_County,_Illinois

    As part of Northern Illinois, DeKalb County was a stronghold for the Free Soil Party in its early elections – being among nine Illinois counties to support Martin Van Buren in 1848 – and became overwhelmingly Republican for the century following that party's formation.

  9. DeWitt County, Illinois - Wikipedia

    en.wikipedia.org/wiki/DeWitt_County,_Illinois

    DeWitt County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 15,516. [1] Its county seat is Clinton. [2] The county was formed on March 1, 1839, from Macon and McLean counties. The county was named in honor of the seventh Governor of New York State, DeWitt Clinton. [3]