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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 OMB defines a core-based statistical area (commonly referred to as a CBSA) as the county or counties (or county-equivalents) surrounding at least one densely-settled core of at least 10,000 population, [2] "plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with ...
Will County is a county in the northeastern part of the state of Illinois. According to the 2020 census , it had a population of 696,355, an increase of 2.8% from 677,560 in 2010, making it Illinois's fourth-most populous county. [ 1 ]
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 ...
Lake County’s economy is “sluggish,” analysts said. “Peoria’s economy has weakened during the last year.” ... As for the state’s demographics, the report notes Illinois gained ...
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 .
As of the 2020 United States census, St. Clair County had a population of 257,400, making it the third most populous county in Illinois outside the Chicago metropolitan area. Belleville is the county’s seat and largest city. [1]
The Chicago metropolitan statistical area (MSA) was originally designated by the United States Census Bureau in 1950. It comprised the Illinois counties of Cook, DuPage, Kane, Lake and Will, along with Lake County in Indiana.