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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.
From 1947 until 1988, the Illinois portion of the Chicago metro area was served by a single area code, 312, which abutted the 815 area code. In 1988 the 708 area code was introduced and the 312 area code became exclusive to the city of Chicago.
ZIP Code prefixes: 600xx–608xx. Area codes: ... Cook County, Illinois – Racial and ethnic composition ... temperatures in Chicago, Cook County average daytime ...
As of September 2023, the average value of a single-family home in the Chicago area was just over $370,000 — about $20,000 above the U.S. average. But in parts of the area, home prices soar far ...
This category is for the Chicago metropolitan area, including populated places, and sub-categories for populated places over 30,000; counties; regions; and sub-regions. Contents Top
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 ]
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 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 ]