Idaho Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Idaho was 1.81M. Among all Idaho counties, Ada was the most populated county (485.25K), followed by Canyon (227.37K), and then Kootenai (168.32K).
On the other hand, the least populated counties were: Clark (839), Camas (1.04K), and Butte (2.57K).
The chart and table below shows the population of each county and the percentage of Idaho population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Idaho ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Idaho Population By County in 2021
Idaho Population By County in 2021
Items per page:
25
0 of 0
| County | Population | % of State Population |
|---|---|---|
| Ada | 485246 | 26.79 |
| Adams | 4321 | 0.24 |
| Bannock | 86362 | 4.77 |
| Bear Lake | 6327 | 0.35 |
| Benewah | 9509 | 0.53 |
| Bingham | 47540 | 2.62 |
| Blaine | 23868 | 1.32 |
| Boise | 7549 | 0.42 |
| Bonner | 46481 | 2.57 |
| Bonneville | 121771 | 6.72 |
| Boundary | 11966 | 0.66 |
| Butte | 2573 | 0.14 |
| Camas | 1044 | 0.06 |
| Canyon | 227367 | 12.55 |
| Caribou | 7003 | 0.39 |
| Cassia | 24469 | 1.35 |
| Clark | 839 | 0.05 |
| Clearwater | 8719 | 0.48 |
| Custer | 4273 | 0.24 |
| Elmore | 28396 | 1.57 |
| Franklin | 14036 | 0.78 |
| Fremont | 13370 | 0.74 |
| Gem | 18692 | 1.03 |
| Gooding | 15422 | 0.85 |
| Idaho | 16494 | 0.91 |
| Jefferson | 30427 | 1.68 |
| Jerome | 24081 | 1.33 |
| Kootenai | 168317 | 9.29 |
| Latah | 39464 | 2.18 |
| Lemhi | 7948 | 0.44 |
| Lewis | 3613 | 0.20 |
| Lincoln | 5184 | 0.29 |
| Madison | 50979 | 2.81 |
| Minidoka | 21393 | 1.18 |
| Nez Perce | 41820 | 2.31 |
| Oneida | 4514 | 0.25 |
| Owyhee | 11815 | 0.65 |
| Payette | 24928 | 1.38 |
| Power | 7854 | 0.43 |
| Shoshone | 13124 | 0.72 |
| Teton | 11490 | 0.63 |
| Twin Falls | 89128 | 4.92 |
| Valley | 11476 | 0.63 |
| Washington | 10425 | 0.57 |