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All Cook County population data above are from the US Census Bureau.
The population data for Cook County are from the Census' American Community Survey 2018 5-year estimates and the Census' 2018 Population Estimates. The demographic data for DeKalb County, DuPage County, Lake County, and Sangamon County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2018 5-year estimates, and were downloaded on 19 December 2019. Check out our FAQ section for more details.
With 5,223,719 people, Cook County is the 1st most populated county in the state of Illinois out of 102 counties. But watch out, Cook County, because DuPage County with 931,743 people and Lake County with 703,619 people are right behind you.
The largest Cook County racial/ethnic groups are White (42.5%) followed by Hispanic (25.2%) and Black (23.2%).
In 2018, the median household income of Cook County residents was $62,088. Cook County households made slightly more than DeKalb County households ($61,086) and Sangamon County households ($60,466) . However, 15.1% of Cook County residents live in poverty.
The median age for Cook County residents is 36.6 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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