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Website. www.cookcountyil.gov. Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541.
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 .
- February 9, 1839
- DuPage River
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Collar Counties. “Collar counties” is a term applied to the five counties that surround the centrally located Cook County in the Chicago metropolitan area: DuPage County, Kane County, Lake County, McHenry County, and Will County. There is no documentation of the origin of the term, but it probably came into use in the 1960s or 1970s.
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Note: the links in the FIPS County Code column are to the United States Census Bureaupage for that county.
Dane County was renamed in 1840 to the current Christian County.The original Knox County, Illinois, became extinct with the formation of the Illinois Territory in 1809 - or, more precisely, it became Knox County, Indiana. The modern Knox County, Illinoiswas for...Hébert, Michael L. (2012). "Illinois County Boundaries: 1790 - Present". ILGenWeb. Archived from the original on January 26, 2016. Retrieved June 16, 2010.White, Jesse (March 2010). "Origin and Evolution of Illinois Counties" (PDF). Illinois Secretary of State.Cook County. When Cook County was organized in 1831 with approximately 100 residents in 2,464 square miles, it encompassed much of what is today Lake , DuPage , Will , McHenry , and Cookcounties. Because of population growth in northeastern Illinois in the 1830s, Cook County lost over half its territory, but continued to increase in population.
Taking its name from the DuPage River , DuPage was established as a separate county from part of Cook County in 1839, with Naperville as the county seat. In 1850, DuPage County was organized into nine townships , through the efforts of state legislator Warren Wheaton (1849–1851). An 1857 attempt to relocate the county seat to Wheaton because ...
Apr 1, 2010 · Side-by-side comparison between Cook county (IL) and DuPage county (IL) using the main population, demographic, and social indicators from the United States Census Bureau.
