Idaho Population By County in 2020
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2020, the population of Idaho was 1,849,415. Among all Idaho counties, Ada had the highest population (498,301), followed by Canyon (233,031), and Kootenai (172,791). Clark was the least populated county (793).
Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.
You can see similar information for other states and by state for the United States.
Related Topics: Idaho Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Idaho Population By County in 2020
Idaho Population By County in 2020
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| County | Population | % of State Population |
|---|---|---|
| Ada | 498301 | 26.94 |
| Adams | 4425 | 0.24 |
| Bannock | 87281 | 4.72 |
| Bear Lake | 6367 | 0.34 |
| Benewah | 9579 | 0.52 |
| Bingham | 48099 | 2.60 |
| Blaine | 24345 | 1.32 |
| Boise | 7663 | 0.41 |
| Bonner | 47411 | 2.56 |
| Bonneville | 124736 | 6.75 |
| Boundary | 12141 | 0.66 |
| Butte | 2583 | 0.14 |
| Camas | 1084 | 0.06 |
| Canyon | 233031 | 12.60 |
| Caribou | 7016 | 0.38 |
| Cassia | 24755 | 1.34 |
| Clark | 793 | 0.04 |
| Clearwater | 8752 | 0.47 |
| Custer | 4269 | 0.23 |
| Elmore | 28680 | 1.55 |
| Franklin | 14283 | 0.77 |
| Fremont | 13419 | 0.73 |
| Gem | 19278 | 1.04 |
| Gooding | 15657 | 0.85 |
| Idaho | 16590 | 0.90 |
| Jefferson | 31082 | 1.68 |
| Jerome | 24268 | 1.31 |
| Kootenai | 172791 | 9.34 |
| Latah | 39638 | 2.14 |
| Lemhi | 7958 | 0.43 |
| Lewis | 3524 | 0.19 |
| Lincoln | 5136 | 0.28 |
| Madison | 52912 | 2.86 |
| Minidoka | 21671 | 1.17 |
| Nez Perce | 42148 | 2.28 |
| Oneida | 4564 | 0.25 |
| Owyhee | 11999 | 0.65 |
| Payette | 25588 | 1.38 |
| Power | 7883 | 0.43 |
| Shoshone | 13205 | 0.71 |
| Teton | 11734 | 0.63 |
| Twin Falls | 90374 | 4.89 |
| Valley | 11842 | 0.64 |
| Washington | 10560 | 0.57 |