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Cook County, established in 1831 and named for the early Illinois Attorney General Daniel Pope Cook, contained the absolute majority of the state's population in the first half of the 20th century and retains more than 40% of it as of the 2020 Census.
The U.S. State of Illinois currently has 47 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 14 combined statistical areas, 12 metropolitan statistical areas, and 21 micropolitan statistical areas in Illinois. [1]
According to the 2020 United States census Illinois is the 6th most populous state with 12,812,508 inhabitants but the 24th largest by land area spanning 55,499.0 square miles (143,742 km 2) of land. [1] Illinois is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages.
Only six counties in Illinois saw growth from 2020 to 2023. Out of 102 counties in Illinois, seven saw growth: Brown County, Bureau County, Grundy County, Jo Daviess County, Kendall County ...
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]
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 ]
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DuPage County (/ d uː ˈ p eɪ dʒ / doo-PAYJ) is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area.As of the 2020 census, the population was 932,877, making it Illinois' second-most populous county.