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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.
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.
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] The county seat is Joliet. [2] Will County is one of the five collar counties of the Chicago–Naperville–Elgin, IL–IN–WI Metropolitan Statistical Area. The portion of Will County ...
Calhoun County is a county in the U.S. state of Illinois. As of the 2020 census , the population was 4,437, [ 1 ] making it Illinois’ third-least populous county. Its county seat and biggest community is Hardin , with a population of 801. [ 2 ]
Logan County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 27,987. [1] Its county seat is Lincoln. [2] Logan County comprises the Lincoln, IL Micropolitan Statistical Area, which is included in the Springfield-Jacksonville-Lincoln, IL Combined Statistical Area.
Thursday’s numbers show Illinois’ population in 2020 was 12.79 million people. The following year, the state was 12.70 million people. In 2022, Illinois continued to shrink with 12.62 million ...
Madison County is a county in the U.S. state of Illinois.It is a part of the Metro East in southern Illinois.According to the 2020 census, it had a population of 264,776, [1] making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state.
As of the 2020 census [1] there were 5,594 people, 2,354 households, and 1,509 families residing in the township. The population density was 149.54 inhabitants per square mile (57.74/km 2). There were 2,410 housing units at an average density of 64.42 per square mile (24.87/km 2).