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The last county, Ford County, was created in 1859. 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.
2023 population (est.) [3] County 2023 ... The 20 primary statistical areas of the State of Illinois [c] 2020 rank ... 2023 estimate [3] Change 2020 Census [4] Change ...
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.
Locally, Sangamon County saw a decrease from July 1 of 2020 to 2023 of 196,144 to 193,491, or 1.35% of the county's population was lost. An aerial view of Springfield is seen on Monday, April 1, 2024.
This is a list of the 100 most populous of the 3,144 counties in the United States based on the national decennial US census conducted on April 1, 2020, and vintage Census population estimates for July 1, 2023. [1] Many of the counties on the list include major cities or metropolitan areas in all parts of the United States.
Champaign County is a county in the U.S. state of Illinois.As of the 2020 Census, its population was 205,865, [1] making it the 10th-most populous county in Illinois. Its county seat is Urbana.
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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.