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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.
Of the 102 counties in the state of Illinois, 17 are divided into minor civil divisions known as precincts. [1] The 261 [ citation needed ] such precincts in Illinois are listed below. The remaining 85 counties are divided into 1,433 townships . [ 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, a type of "home rule", which allows localities to govern themselves to a certain extent. [4]
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 ...
Table of United States congressional district boundary maps in the State of Illinois, presented chronologically. [7] All redistricting events that took place in Illinois from statehood in 1818 to 2013 are shown. During the periods of 1863-1873, 1893-1895, and 1903-1948, voters in Illinois elected an additional one to two at-large representatives.
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
ZIP Code(s) 61080. Area codes: 815, 779: ... Illinois had become a state in 1818, Winnebago County was organized in January 1836, and public surveys started in the ...
Madison is located in southwestern Madison County at (38.683700, -90.151047 The central city area is bordered by Granite City to the north and Venice to the southwest. . However, the Madison city limits now extend 3 miles (5 km) south, 4 miles (6 km) east, and 8 miles (13 km) north of the city center, so that it is also bordered by Hartford to the extreme north, Pontoon Beach to the east ...