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  2. List of counties in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Illinois

    Knox would later become a county in Indiana and is unrelated to the current Knox County in Illinois, while St. Clair would become the oldest county in Illinois. 15 counties had been created by the time Illinois achieved statehood in 1818. The last county, Ford County, was created in 1859.

  3. Winchester, Illinois - Wikipedia

    en.wikipedia.org/wiki/Winchester,_Illinois

    Winchester is a city in and the county seat of Scott County, Illinois, United States. [3] The population was 1,593 at the 2010 census. Winchester is part of the Jacksonville Micropolitan Statistical Area .

  4. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    815/779: Northern Illinois outside of the immediate Chicago area including Joliet, Kankakee, LaSalle, DeKalb, and Rockford. Area code 815 was overlaid with area code 779 in 2007. 847/224: North and northwest suburbs of Chicago including all of Lake County, part of McHenry County, northern Cook County, and northeastern Kane County.

  5. List of precincts in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_precincts_in_Illinois

    Toggle Illinois precincts by county subsection. 2.1 Alexander County. 2.2 Calhoun County. 2.3 Edwards County. 2.4 Hardin County. 2.5 Johnson County. 2.6 Massac County ...

  6. Carroll County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Carroll_County,_Illinois

    Carroll County is a county located in the U.S. state of Illinois. As of the 2020 census , the population was 15,702. [ 1 ] Its county seat is Mount Carroll .

  7. Boone County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Boone_County,_Illinois

    Boone County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 53,448. Its county seat is Belvidere. [1] Boone County is included in the Rockford, Illinois metropolitan area.

  8. Clinton County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Clinton_County,_Illinois

    Clinton County is a county located in the U.S. state of Illinois. At the 2020 census, the population was 36,899. [1] Its county seat is Carlyle. [2] In 1960, the United States Census Bureau placed the mean center of U.S. population in Clinton County. [3] Clinton County is part of the St. Louis, MO-IL Metropolitan Statistical Area.

  9. Will County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Will_County,_Illinois

    Will County is a county in the northeastern part of the state of Illinois. According to the 2020 census , it had a population of 696,355, an increase of 2.8% from 677,560 in 2010, making it Illinois's fourth-most populous county. [ 1 ]