Median Age in Ada County, ID
ACS 2024 5-Year Estimates
38.4 years
Rank #2,497/3,222 · #26 in ID
23th
Ada 38.4 years
ID 37.3 years +2.9%
US 38.9 years -1.3%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Ada County's median age of 38.4 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 Ada County for median age.
Nearby Rankings
Full ranking →| #2,494 | Berkeley County, WV | 38.5 years |
| #2,495 | Laramie County, WY | 38.5 years |
| #2,496 | Hall County, GA | 38.4 years |
| #2,497 | Ada County, ID | 38.4 years |
| #2,498 | DeKalb County, IN | 38.4 years |
| #2,499 | Hamilton County, IN | 38.4 years |
| #2,500 | Jackson County, IN | 38.4 years |
About Median Age
Ada County, Idaho has a median age of 38.4 years, ranking #2,497 of 3,222 counties nationwide — 1.3% below the national value of 38.9 years. Within Idaho, it ranks #26 of 44. This places it in the 23th 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.