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There are 102 counties in Illinois. 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.
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]
In coordination with member state national governments, Eurostat releases 1 January member state population figures every July; below are the 1 January 2024 data released in July 2024. [ 1 ] [ 2 ] Country
Saline County is a county in Southern Illinois.At the 2020 census, it had a population of 23,768. [1] The largest city and county seat is Harrisburg. [2] This area of Southern Illinois is known locally as "Little Egypt".
As defined by the federal government, the Chicago Metropolitan Area includes two counties in Indiana, two counties in Wisconsin, and the following 11 counties in Illinois: Cook, DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall, Lake, LaSalle, McHenry, and Will counties. The Rockford Metropolitan Area is north-central near Wisconsin, on the Rock ...
Putnam County is the least extensive county in the U.S. state of Illinois.According to the 2020 census, it had a population of 5,637. [1] The county seat is Hennepin. [2] The county was formed in 1825 out of Fulton County and named after Israel Putnam, [3] who was a general in the American Revolution.
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.
Effingham County is a county located in the south central part of the U.S. state Illinois. As of the 2020 census, the population was 34,668. [1] Its county seat and largest city is Effingham. Some other cities in Effingham County, Illinois include Altamont, Teutopolis, Beecher City, Montrose, Dieterich, Shumway, Watson, Mason, and Edgewood ...