In 2019, Cook County, IL had a population of 5.15M people with a median age of 37.2 and a median household income of $69,429. Between 2018 and 2019 the population of Cook County, IL declined from 5.18M to 5.15M, a −0.584% decrease and its median household income grew from $63,353 to $69,429, a 9.59% increase.
The 5 largest ethnic groups in Cook County, IL are White (Non-Hispanic) (41.8%), Black or African American (Non-Hispanic) (22.7%), White (Hispanic) (14.8%), Other (Hispanic) (9.16%), and Asian (Non-Hispanic) (7.56%). 35.3% of the households in Cook County, IL speak a non-English language at home as their primary language.
90.2% of the residents in Cook County, IL are U.S. citizens.
The largest universities in Cook County, IL are Northwestern University (8,930 degrees awarded in 2020), University of Illinois at Chicago (8,017 degrees), and University of Chicago (6,323 degrees).
In 2019, the median property value in Cook County, IL was $261,400, and the homeownership rate was 56.7%. Most people in Cook County, IL drove alone to work, and the average commute time was 31.9 minutes. The average car ownership in Cook County, IL was 2 cars per household.
Cook County, IL borders DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Will County, IL, Lake County, IN, Porter County, IN, and Berrien County, MI.