# Counties in Idaho by median age, 2024

All 44 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `median_age`
- Unit: years
- Definition: Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/median-age/idaho-counties
- CSV: https://invokely.ai/download/rankings/median-age/idaho-counties.csv

| Rank | Place | years |
|---:|---|---:|
| 1 | Custer County | 60 |
| 2 | Adams County | 53.9 |
| 3 | Boise County | 53.4 |
| 4 | Lemhi County | 53.3 |
| 5 | Clearwater County | 52.2 |
| 6 | Idaho County | 49.4 |
| 7 | Lewis County | 49 |
| 8 | Bonner County | 48.1 |
| 9 | Valley County | 46.9 |
| 10 | Blaine County | 45.6 |
| 11 | Benewah County | 45.5 |
| 12 | Washington County | 45 |
| 13 | Shoshone County | 44.8 |
| 14 | Gem County | 44.2 |
| 15 | Boundary County | 43.7 |
| 16 | Butte County | 41.3 |
| 17 | Nez Perce County | 41.2 |
| 18 | Kootenai County | 40.9 |
| 19 | Oneida County | 40.8 |
| 20 | Bear Lake County | 40.5 |
| 21 | Fremont County | 40 |
| 22 | Teton County | 39.6 |
| 23 | Owyhee County | 39 |
| 24 | Payette County | 38.9 |
| 25 | Caribou County | 38.5 |
| 26 | Ada County | 38.4 |
| 27 | Gooding County | 38.1 |
| 28 | Lincoln County | 37.2 |
| 29 | Camas County | 36.8 |
| 30 | Twin Falls County | 36.1 |
| 31 | Bannock County | 35.2 |
| 32 | Bingham County | 35 |
| 33 | Canyon County | 34.9 |
| 33 | Minidoka County | 34.9 |
| 35 | Power County | 34.6 |
| 36 | Jerome County | 34 |
| 37 | Bonneville County | 33.6 |
| 38 | Franklin County | 33.3 |
| 39 | Cassia County | 33.2 |
| 40 | Elmore County | 33.1 |
| 41 | Jefferson County | 32.8 |
| 42 | Clark County | 31.1 |
| 43 | Latah County | 30.6 |
| 44 | Madison County | 21.4 |