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The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 January 2025. "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 ...
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For more information, see Commons:United States county locator maps. Public domain Public domain false false I, the copyright holder of this work, release this work into the public domain .
Use a different map base that distinguishes between adjacent counties. 20:48, 19 April 2013: 3,453 × 6,157 (84 KB) Dewclouds: Fixed typo in source to add Randolph County. 18:58, 24 February 2007: 3,453 × 6,157 (84 KB) Dual Freq: This is a map highlighting Illinois counties without township government (Precincts not townships).
The basic subdivisions of Illinois are the 102 counties. [2] Illinois has more units of local government than any other state—over 8,000 in all. [3] The Constitution of 1970 created, for the first time in Illinois, a type of "home rule", which allows localities to govern themselves to a certain extent. [4]
A total of 45 counties are typically considered to be within Central Illinois, with a population of 1,874,635 as of the 2020 U.S. Census. Major cities include Peoria , Springfield (the state capital ), Decatur , Quincy , Champaign – Urbana , Bloomington – Normal , Galesburg , and Danville .
Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; ... Cities in Illinois by county (101 C) Towns in Illinois by county (18 C)