Median Age in Cook County, IL
ACS 2024 5-Year Estimates
How Cook County Compares
National Distribution
Where Cook County falls among all 3,222 U.S. counties for median age.
■ Cook County: 38.0 years
Ranking Context
| Rank | County | Value |
|---|---|---|
| #2,574 | Greene County, AR | 38.0 years |
| #2,575 | Sebastian County, AR | 38.0 years |
| #2,576 | Polk County, GA | 38.0 years |
| #2,577 | Cook County, IL | 38.0 years |
| #2,578 | Johnson County, IN | 38.0 years |
| #2,579 | Leavenworth County, KS | 38.0 years |
| #2,580 | Robertson County, KY | 38.0 years |
Median Age in Cook County, Illinois
Cook County, Illinois has a median age of 38.0 years, which ranks #2,577 of 3,222 out of 3,222 counties nationwide. This is 2.3% below the national value of 38.9 years.
Within Illinois, Cook County ranks #95 of 102 out of 102 counties. This places it in the 20th percentile nationally.
The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.