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Cook County, established in 1831 and named for the early Illinois Attorney General Daniel Pope Cook, contained the absolute majority of the state's population in the first half of the 20th century and retains more than 40% of it as of the 2020 census.
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.
Locally, Sangamon County saw a decrease from July 1 of 2020 to 2023 of 196,144 to 193,491, or 1.35% of the county's population was lost. An aerial view of Springfield is seen on Monday, April 1, 2024.
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]
In 2013, Illinois’ annual population estimate showed an increase of 12,700. The following year began the decade of decline. In 2014, the state lost an estimated 10,700.
A total of 45 counties are typically considered to be within Central Illinois, with a population of 1,874,635 as of the 2020 U.S. Census. Major cities include Peoria , Springfield (the state capital ), Decatur , Quincy , Champaign – Urbana , Bloomington – Normal , Galesburg , and Danville .
Almost 60% of Illinois' minority population, including over 67% of the black population, lives in Cook County, while the county includes around 40% of the state's total population. [104] Cook County, which is home to Chicago , is the only majority-minority county within Illinois, with non-Hispanic whites making up a plurality of 40.4% of the ...
The U.S. State of Illinois currently has 47 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 14 combined statistical areas , 12 metropolitan statistical areas , and 21 micropolitan statistical areas in Illinois. [ 1 ]