Median Age in Boone County, IL
ACS 2024 5-Year Estimates
39.7 years
Rank #2,194/3,222 · #84 in IL
32th
Boone 39.7 years
IL 39.0 years +1.8%
US 38.9 years +2.1%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Boone County's median age of 39.7 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 Boone County for median age.
Nearby Rankings
Full ranking →| #2,191 | Liberty County, FL | 39.7 years |
| #2,192 | Forsyth County, GA | 39.7 years |
| #2,193 | Bond County, IL | 39.7 years |
| #2,194 | Boone County, IL | 39.7 years |
| #2,195 | Lake County, IN | 39.7 years |
| #2,196 | Webster County, IA | 39.7 years |
| #2,197 | Franklin County, KS | 39.7 years |
About Median Age
Boone County, Illinois has a median age of 39.7 years, ranking #2,194 of 3,222 counties nationwide — 2.1% above the national value of 38.9 years. Within Illinois, it ranks #84 of 102. This places it in the 32th 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.