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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. Successive territorial governments created 15 counties by the time Illinois achieved statehood in 1818. The last county, Ford County, was created by the Illinois government in 1859.
New data shows nearly every Illinois county saw a population decrease from 2020-2023 in Illinois—including Sangamon County. ... 94,927 in 2022 and 58,105 in 2023.
The 47 United States statistical areas and 102 counties of the State of Illinois [a]; Combined statistical area [1] 2023 population (est.) [3] Core-based statistical area [1] ...
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.
In 2022, Illinois continued to shrink with 12.62 million people. But, Thursday’s Census update has the population increasing to 12.42 million in 2023 and up to 12.71 million for 2024.
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.
Around 40% of the population of Illinois live in the northeast Cook County alone, and 75% live within the wider Chicago metropolitan area. (Figures from 2020) The population of the state of Illinois is heavily concentrated in Cook County, including the city of Chicago. With 40% of the population, the county has a large impact of state politics. [1]
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