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The last county, Ford County, was created in 1859. 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.
The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico. [2] These statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau, planning organizations, and federal, state, and local government entities.
Map of the United States with Illinois highlighted. Illinois is a state located in the Midwestern United States.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]
Madison County is a county in the U.S. state of Illinois.It is a part of the Metro East in southern Illinois.According to the 2020 census, it had a population of 264,776, [1] making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state.
Centralia is a city in Clinton, Jefferson, Marion, and Washington counties in the U.S. state of Illinois with the largest portion in Marion County. The city is the largest in three counties, Clinton, Marion, and Washington, but it is not a county seat for any of them. The population was 12,182 as of the 2020 census, down from 13,032 in 2010. [4]
According to Census Bureau estimates, the county's population grew by 5.3% from 1990 to 2000, decreased by 3.4% between the 2000 census and the 2010 census, and ...
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 .
Located in far northern Illinois on the banks of the Rock River, Rockford is the county seat of Winnebago County. The population was 148,655 at the 2020 census, making Rockford the fifth-most populous city in Illinois, as well as the state's most populous city outside of the Chicago metropolitan area. [11]