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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. Category:Geography of Illinois by county - Wikipedia

    en.wikipedia.org/wiki/Category:Geography_of...

    Geography of Montgomery County, Illinois (3 C, 1 P) Geography of Morgan County, Illinois (3 C, 1 P) Geography of Moultrie County, Illinois (3 C) O.

  4. Edwards County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Edwards_County,_Illinois

    According to the U.S. Census Bureau, the county has a total area of 223 square miles (580 km 2), of which 222 square miles (570 km 2) is land and 0.3 square miles (0.78 km 2) (0.1%) is water. [4] It is the fourth-smallest county in Illinois by area. When Edwards County was formed in 1814, it comprised nearly half of the State of Illinois.

  5. Williamson County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Williamson_County,_Illinois

    Williamson County is a county in Southern Illinois. At the 2020 census, it had a population of 67,153. [1] The largest city and county seat is Marion. [2] Williamson County is included in the Carbondale-Marion, IL Metropolitan Statistical Area. This area of Southern Illinois is known locally as "Little Egypt". [citation needed]

  6. Putnam County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Putnam_County,_Illinois

    Putnam County is the least extensive county in the U.S. state of Illinois.According to the 2020 census, it had a population of 5,637. [1] The county seat is Hennepin. [2] The county was formed in 1825 out of Fulton County and named after Israel Putnam, [3] who was a general in the American Revolution.

  7. Saline County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Saline_County,_Illinois

    Saline County is a county in Southern Illinois. At the 2020 census , it had a population of 23,768. [ 1 ] The largest city and county seat is Harrisburg . [ 2 ]