Median Age in Williamson County, IL
ACS 2024 5-Year Estimates
41.6 years
Rank #1,616/3,222 · #61 in IL
50th
Williamson 41.6 years
IL 39.0 years +6.7%
US 38.9 years +6.9%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Williamson County's median age of 41.6 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 Williamson County for median age.
Nearby Rankings
Full ranking →| #1,613 | Peñuelas Municipio, PR | 41.7 years |
| #1,614 | Desha County, AR | 41.6 years |
| #1,615 | Glascock County, GA | 41.6 years |
| #1,616 | Williamson County, IL | 41.6 years |
| #1,617 | Parke County, IN | 41.6 years |
| #1,618 | Jackson Parish, LA | 41.6 years |
| #1,619 | Chippewa County, MI | 41.6 years |
About Median Age
Williamson County, Illinois has a median age of 41.6 years, ranking #1,616 of 3,222 counties nationwide — 6.9% above the national value of 38.9 years. Within Illinois, it ranks #61 of 102. This places it in the 50th 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.