Median Age in McDonough County, IL
ACS 2024 5-Year Estimates
34.9 years
Rank #2,977/3,222 · #98 in IL
8th
McDonough 34.9 years
IL 39.0 years -10.5%
US 38.9 years -10.3%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How McDonough County's median age of 34.9 years compares to all 3,222 U.S. counties. Values range from 21.4 years to 86.2 years.
Distribution of Median Age Across All Counties
Ranking Context
Counties ranked closest to McDonough County for median age.
Nearby Rankings
Full ranking →| #2,974 | Randolph County, GA | 34.9 years |
| #2,975 | Canyon County, ID | 34.9 years |
| #2,976 | Minidoka County, ID | 34.9 years |
| #2,977 | McDonough County, IL | 34.9 years |
| #2,978 | Titus County, TX | 34.9 years |
| #2,979 | Adams County, CO | 34.8 years |
| #2,980 | Rockland County, NY | 34.8 years |
About Median Age
McDonough County, Illinois has a median age of 34.9 years, ranking #2,977 of 3,222 counties nationwide — 10.3% below the national value of 38.9 years. Within Illinois, it ranks #98 of 102. This places it in the 8th percentile nationally.
The median age of the total population. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.