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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 ...
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]
Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region. Chicago, the third-most populous city in the United States, is the center of the Chicago metropolitan area or Chicagoland, as this area is nicknamed.
The Quad Cities Metropolitan Area is on both sides of the Mississippi River separating Illinois from Iowa. 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 ...
The location of the state of Illinois in the United States of America An enlargeable map of the 102 counties of the state of Illinois. Prehistory of Illinois. Indigenous peoples. Mississippian culture. Cahokia; French colony of Louisiane, 1699–1763; Upper Louisiana was called Illinois Country. Treaty of Paris of 1763
Date/Time Thumbnail Dimensions User Comment; current: 14:18, 2 February 2007: 3,453 × 6,157 (83 KB): Dual Freq: This is a map showing Illinois counties Modification of David Benbennick's map.
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 .