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Jun 20, 2024 · The most populated counties in Illinois are Cook County with 5,087,072, DuPage County at 921,213, Lake County with 708,760, Will County at 700,728, and Kane County with 514,982.
There are 102 counties in Illinois. In 2019, the most highly populated county within the state of Illinois is Cook County, home to the city of Chicago. With a population of 5,180,493, Cook County has seen a decrease in the total population of 0.36% since the last U.S. census was taken in 2010.
There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
Which is the most populous county in Illinois? Cook County in Illinois, USA, is the most populous county, with a resident population of 5,275,541 according to the 2020 US census data. With a 932,877 resident population DuPage County, IL ranks as the second most populated county in the state.
6 days ago · The most recent county-level data available by age, race, sex, and ethnicity are the Vintage 2020 Population Estimates (census.gov) for 2010 to 2019 and the Vintage 2022 Population Estimates (census.gov) for 2020 through 2022. We will update this experience, including the 2010-2019 estimates, when the Bureau releases county-level 2010-2020 ...
Map, bar chart, and table showing Population, 2019 estimate by county. The source of the data is the US Census Bureau.
Cook County is the largest county in Illinois, housing 5,238,216 people. The next largest county is neighboring Dupage, with 933,736 people. Almost half of the Illinois population can be found in just those two counties.
