Median Age in Decatur County, IA
ACS 2024 5-Year Estimates
36.1 years
Rank #2,860/3,222 · #93 in IA
11th
Decatur 36.1 years
IA 38.6 years -6.5%
US 38.9 years -7.2%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Decatur County's median age of 36.1 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 Decatur County for median age.
Nearby Rankings
Full ranking →| #2,857 | San Benito County, CA | 36.1 years |
| #2,858 | Twin Falls County, ID | 36.1 years |
| #2,859 | Dallas County, IA | 36.1 years |
| #2,860 | Decatur County, IA | 36.1 years |
| #2,861 | Woodbury County, IA | 36.1 years |
| #2,862 | Atchison County, KS | 36.1 years |
| #2,863 | Todd County, KY | 36.1 years |
About Median Age
Decatur County, Iowa has a median age of 36.1 years, ranking #2,860 of 3,222 counties nationwide — 7.2% below the national value of 38.9 years. Within Iowa, it ranks #93 of 99. This places it in the 11th 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.