Median Age in Marion County, IL
ACS 2024 5-Year Estimates
How Marion County Compares
National Distribution
Where Marion County falls among all 3,222 U.S. counties for median age.
■ Marion County: 41.5 years
Ranking Context
| Rank | County | Value |
|---|---|---|
| #1,640 | Schley County, GA | 41.5 years |
| #1,641 | Wilcox County, GA | 41.5 years |
| #1,642 | Clinton County, IL | 41.5 years |
| #1,643 | Marion County, IL | 41.5 years |
| #1,644 | Miami County, IN | 41.5 years |
| #1,645 | Shelby County, IN | 41.5 years |
| #1,646 | Washington County, IN | 41.5 years |
Median Age in Marion County, Illinois
Marion County, Illinois has a median age of 41.5 years, which ranks #1,643 of 3,222 out of 3,222 counties nationwide. This is 6.7% above the national value of 38.9 years.
Within Illinois, Marion County ranks #63 of 102 out of 102 counties. This places it in the 49th 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.