# Counties in Idaho by population density, 2025

All 44 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_density`
- Unit: inhabitants per km²
- Definition: Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.
- Source: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km² (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-09
- Citation: U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.
- Web page: https://invokely.ai/rankings/population-density/idaho-counties
- CSV: https://invokely.ai/download/rankings/population-density/idaho-counties.csv

| Rank | Place | inhabitants per km² |
|---:|---|---:|
| 1 | Ada County | 200.4 |
| 2 | Canyon County | 180.9 |
| 3 | Kootenai County | 59.8 |
| 4 | Madison County | 45.4 |
| 5 | Bannock County | 31.8 |
| 6 | Bonneville County | 28.1 |
| 7 | Payette County | 26.4 |
| 8 | Twin Falls County | 19.6 |
| 9 | Nez Perce County | 19.5 |
| 10 | Jerome County | 17 |
| 11 | Gem County | 15 |
| 12 | Latah County | 15 |
| 13 | Jefferson County | 12.5 |
| 14 | Bonner County | 12.1 |
| 15 | Minidoka County | 11.7 |
| 16 | Teton County | 11.4 |
| 17 | Bingham County | 9.4 |
| 18 | Franklin County | 9.3 |
| 19 | Gooding County | 8.7 |
| 20 | Benewah County | 5.2 |
| 21 | Boundary County | 4.3 |
| 22 | Cassia County | 4 |
| 23 | Blaine County | 3.7 |
| 24 | Elmore County | 3.7 |
| 25 | Washington County | 3.1 |
| 26 | Lewis County | 3 |
| 27 | Fremont County | 2.9 |
| 28 | Bear Lake County | 2.7 |
| 29 | Power County | 2.3 |
| 30 | Shoshone County | 2.1 |
| 31 | Lincoln County | 1.8 |
| 32 | Boise County | 1.7 |
| 33 | Oneida County | 1.6 |
| 34 | Caribou County | 1.6 |
| 35 | Clearwater County | 1.4 |
| 36 | Adams County | 1.4 |
| 37 | Valley County | 1.4 |
| 38 | Idaho County | 0.8 |
| 39 | Lemhi County | 0.7 |
| 40 | Owyhee County | 0.6 |
| 41 | Butte County | 0.5 |
| 42 | Camas County | 0.5 |
| 43 | Custer County | 0.4 |
| 44 | Clark County | 0.2 |