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Cook County Offers Discount Parking to Residents Seeking County Services in Downtown Chicago
Cook County's population is larger than that of 28 different U.S. states and territories, and larger than the population of 11 of the 13 Canadian provinces and territories. Cook County is included in the Chicago metropolitan Combined Statistical Area (CSA), which has a population of approximately 10 million people.
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The unincorporated Fort Dearborn settlement at the mouth of the Chicago River became the new county’s seat. On May 7, 1831, Cook County elected its first officials. Cook County is an urban county in the upper northeastern section of the State of Illinois that contains more than 800 local governmental units within its boundaries.
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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 vintage year (e.g., V2022) refers to the final year of the series (2020 thru 2022). Different vintage years of estimates are not comparable. Users should exercise caution when comparing 2017-2021 ACS 5-year estimates to other ACS estimates. For more information, please visit the 2021 5-year ACS Comparison Guidance.
In the late 1970s, a movement started which proposed a separation of six northwest suburban townships, Cook County's panhandle ( Barrington, Hanover, Palatine, Wheeling, Schaumburg, and Elk Grove) from Cook to form Lincoln County, in honor of the former U.S. president and Illinois resident. 
In 2021, the tract with the highest Median Household Income in Cook County, IL was Census Tract 706 with a value of $250,001, followed by Census Tract 8004 and Census Tract 8005, with respective values of $250,001 and $250,001. In 2022, 21% of the population was living with severe housing problems in Cook County, IL.
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