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Illinois' population slightly declined in 2020 from the 2010 United States census by just over 18,000 residents and the overall population was quite higher than recent census estimates. [84] Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region.
Illinois's FIPS state code is 17 and its postal abbreviation is IL. What is now Illinois was claimed as part of Illinois County, Virginia, between 1778 and 1782. Modern-day county formation dates to 1790 when the area was part of the Northwest Territory; two counties—St. Clair and Knox—were created at that time.
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 December 2024. "Cities in Illinois" redirects here. For unincorporated communities, see List of unincorporated communities in Illinois. For CDPs, see List of census-designated places in Illinois. Map of the United States with Illinois highlighted Illinois is a state located in the Midwestern United ...
The administrative divisions of Illinois are the counties, townships, precincts, cities, towns, villages, and special-purpose districts. [11] Illinois has more units of local government than any other state—over 8,000 in all. The basic subdivision of Illinois are the 102 counties. [12] 85 of the 102 counties are in turn divided into 1,432 ...
The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
In May 2013, Illinois' state (public) universities, colleges, and community colleges agreed, pending formation and passage of the legislation before the end of the state's legislative session, at Illinois House Speaker Michael Madigan and other members' repeated urging, to gradually assume more of the burden- half of a percent of the retirement ...
Illinois was admitted to the Union on December 3, 1818, consisting of the southern portion of Illinois Territory; the remainder was assigned to Michigan Territory. [17]The first Illinois Constitution, ratified in 1818, provided that a governor be elected every 4 years [18] for a term starting on the first Monday in the December following an election. [19]
Springfield is the capital city of the U.S. state of Illinois and the seat of Sangamon County.The city's population was 114,394 at the 2020 census, which makes it the state's seventh-most populous city, [10] the second-most populous outside of the Chicago metropolitan area (after Rockford), and the most populous in Central Illinois.