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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.
Will County is a county in the northeastern part of the state of Illinois. According to the 2020 census, it had a population of 696,355, an increase of 2.8% from 677,560 in 2010, making it Illinois's fourth-most populous county. [ 1] The county seat is Joliet. [ 2] Will County is one of the five collar counties of the Chicago–Naperville ...
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 ...
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 ...
LaSalle County is a county located within the Fox Valley and Illinois River Valley regions of the U.S. state of Illinois. As of the 2020 Census, it had a population of 109,658. [ 3 ] Its county seat and largest city is Ottawa. [ 4 ] LaSalle County is part of the Ottawa, IL Micropolitan Statistical Area of Northern Illinois .
UTC−5 ( CDT) Congressional district. 12th. Website. www.lawrencecounty. illinois.com. Lawrence County is the easternmost county in the U.S. state of Illinois. At the 2020 census, the population was 15,280. [ 1] Its county seat is Lawrenceville.
Winnebago County. / 42.33°N 89.16°W / 42.33; -89.16. Winnebago County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 285,350 making it the seventh most populous county in Illinois behind Cook County and its five surrounding collar counties. Its county seat is Rockford. [ 1]