Ranking of Idaho Counties By Population in 2021
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2021, the Population for Idaho was 1.91M. Among all Idaho counties, Ada County had the highest population (513.10K), followed by Canyon County (243.75K), and Kootenai County (180.09K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Idaho counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Idaho Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2021 Census.
See this for other years:
Ranking of Idaho Counties By Population in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Ada County | 513098 |
| 2 | Canyon County | 243752 |
| 3 | Kootenai County | 180089 |
| 4 | Bonneville County | 128072 |
| 5 | Twin Falls County | 92410 |
| 6 | Bannock County | 88523 |
| 7 | Madison County | 54079 |
| 8 | Bonner County | 49649 |
| 9 | Bingham County | 48938 |
| 10 | Nez Perce County | 42511 |
| 11 | Latah County | 40406 |
| 12 | Jefferson County | 32208 |
| 13 | Elmore County | 28994 |
| 14 | Payette County | 26385 |
| 15 | Cassia County | 25242 |
| 16 | Blaine County | 24784 |
| 17 | Jerome County | 24740 |
| 18 | Minidoka County | 21951 |
| 19 | Gem County | 19813 |
| 20 | Idaho County | 17059 |
| 21 | Gooding County | 15806 |
| 22 | Franklin County | 14673 |
| 23 | Shoshone County | 13623 |
| 24 | Fremont County | 13593 |
| 25 | Boundary County | 12627 |
| 26 | Owyhee County | 12362 |
| 27 | Teton County | 12273 |
| 28 | Valley County | 12258 |
| 29 | Washington County | 10905 |
| 30 | Benewah County | 9900 |
| 31 | Clearwater County | 8927 |
| 32 | Lemhi County | 8158 |
| 33 | Boise County | 8133 |
| 34 | Power County | 7980 |
| 35 | Caribou County | 7115 |
| 36 | Bear Lake County | 6569 |
| 37 | Lincoln County | 5289 |
| 38 | Adams County | 4621 |
| 39 | Oneida County | 4604 |
| 40 | Custer County | 4444 |
| 41 | Lewis County | 3689 |
| 42 | Butte County | 2665 |
| 43 | Camas County | 1137 |
| 44 | Clark County | 794 |