Now you can skip hours of internet research and jump straight to getting answers with our meaningful at-a-glance Demographics Spreadsheet Report. With the most current & most popular demographic data, it's the perfect starting point for your research about Cook County and the rest of Illinois.
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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 2000, Census 2010, the Census' American Community Survey 2015 5-year estimates and the Census' 2016 Population Estimates. The demographic data for DuPage County, Lake County, Mercer County, and Ogle County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2015 5-year estimates, and were downloaded on December 2016. Check out our FAQ section for more details.
With 5,203,499 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 929,368 people and Lake County with 703,047 people are right behind you.
The largest Cook County racial/ethnic groups are White (43.1%) followed by Hispanic (24.7%) and Black (23.7%).
In 2015, the median household income of Cook County residents was $55,251. Cook County households made slightly more than Mercer County households ($54,757) and Ogle County households ($54,849) . However, 17.1% of Cook County residents live in poverty.
The median age for Cook County residents is 35.9 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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