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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 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 ...
Illinois is the 11th-wealthiest of the 50 United States, with a per capita income of $23,104 according to the 2000 census. Illinois counties ranked by per capita income [ edit ]
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.
DuPage County (/ d uː ˈ p eɪ dʒ / doo-PAYJ) is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area. As of the 2020 census , the population was 932,877, making it Illinois' second-most populous county .
WPA poster for the Cook County Public Health Unit (1941) The administrative divisions of Illinois are the counties, townships, precincts, cities, towns, villages, and special-purpose districts. [11] Illinois has more units of local government than any other state—over 8,000 in all. The basic subdivision of Illinois are the 102 counties.
The following is a list of school districts in Illinois. As of July 1, 2023 [update] , there were 852 public school districts , including 368 elementary districts, 97 high school districts, 386 unit districts , and one Illinois Department of Juvenile Justice district, and two cooperative high schools.
This is a list of the area codes in the state of Illinois and its numbering plan areas in the North American Numbering Plan.. All NPAs within Illinois. 217/447: Central Illinois, including the region running west from the Illinois-Indiana border through Danville, Effingham, Champaign–Urbana, Decatur, Springfield, Quincy until Illinois' western border with Missouri and Iowa.