Cook County, IL Number of People with Medicare Health Insurance Coverage By Age Group in 2021

Updated on October 18, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 801,859 people in Cook County, IL with Medicare Health Insurance Coverage (i.e. 15.36% of Cook County, IL population).

Among those with Medicare health insurance coverage, 1.01% of them belonged to the Under 19 Years age group, 11.26% of them belonged to the 19 to 64 Years age group, and 87.73% of them belonged to the 65 Years and Over age group.

The chart below shows the percentage of the Cook County, IL population with Medicare health insurance coverage, and the table below shows the number of people and the percentage.

You can see similar information for other types of health insurance coverages.

You can also see similar information for other Illinois counties, and for Illinois.

Cook County, IL Percentage of People with Medicare Health Insurance Coverage By Age Group in 2021
65 Years and Over
19 to 64 Years
Under 19 Years
Cook County, IL Number of People with Medicare Health Insurance Coverage By Age Group in 2021
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Age Num. of People with Medicare Health Ins. Percent of People With Medicare Health Ins. (%)
Under 19 Years 8131 1.01
19 to 64 Years 90298 11.26
65 Years and Over 703430 87.73