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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.
According to the 2020 United States census Illinois is the 6th most populous state with 12,812,508 inhabitants but the 24th largest by land area spanning 55,499.0 square miles (143,742 km 2) of land. [1] Illinois is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages.
The administrative divisions of Illinois are counties, townships, precincts, cities, towns, villages, and special-purpose districts. [1] 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 ...
List of United States FIPS codes by county. ... Illinois: 17003 Alexander County: 17005 Bond County: 17007 Boone County: 17009 Brown County: 17011 Bureau County: 17013
Overall, in estimate Illinois saw a decline in growth from just over 12.813 million in 2020 to 12.549 million 2023. Cook County, which is home to the Chicago metropolitan area, has been on rapid ...
This is a list of municipalities of all types (including cities, towns, and villages) in the United States that lie in more than one county (or, in the case of Louisiana, in more than one parish). Counties are listed in descending order of the county's share of the municipal population per the 2000 census.
Website. www.cookcountyil.gov. Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541.
McHenry County, Illinois. / 42.32°N 88.45°W / 42.32; -88.45. McHenry County is a county located in the U.S. state of Illinois. According to the 2020 Census, it had a population of 310,229, [ 2] making it the sixth-most populous county in Illinois. Its county seat is Woodstock. [ 3] McHenry County is one of the five Illinois collar ...