Illinois Outline Illinois Demographics by Cubit

Is Cook County the best Illinois county for your business?

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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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Cook County Population

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.

Cook County Demographics Summary

population icon Population

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.

race icon Race & Ethnicity

The largest Cook County racial/ethnic groups are White (43.1%) followed by Hispanic (24.7%) and Black (23.7%).

income icon Median Income

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.

age icon Median Age

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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Customer Quotes:

"Your starter report certainly saved me a considerable amount of time. I am just too busy to garner this needed data any other way. It truly would have taken hours of an employee's time or my own to get this much information. I was fortunate to find a company that had all the demographics that I needed and at a very reasonable price."
— Steven Silva

"My supervisor had assigned me the task of getting population data for the county for our required county education strategic plan. I had some information from Kids Count but need race, gender, age, etc. and the government census site was shutdown. I was so surprised to get a report within seconds and it had lots of charts and graphs that my supervisor liked."
—Jean Hinzman.

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