Idaho Counties by Population (2025)
by Kristen Carney 
Updated: August 7, 2025
The most populous counties in Idaho are Ada County with 535,799, Canyon County at 266,892, Kootenai County with 188,323, Bonneville County at 133,644, and Twin Falls County with 96,509. You can get the most current Census population data for all 44 Idaho counties, sorted from the most populous counties in Idaho to the least, according to the 2024 Population Estimates Program.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Idaho counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | Ada County | 535,799 |
| 2 | Canyon County | 266,892 |
| 3 | Kootenai County | 188,323 |
| 4 | Bonneville County | 133,644 |
| 5 | Twin Falls County | 96,509 |
| 6 | Bannock County | 91,010 |
| 7 | Madison County | 55,549 |
| 8 | Bonner County | 53,955 |
| 9 | Bingham County | 50,889 |
| 10 | Nez Perce County | 42,847 |
| 11 | Latah County | 42,180 |
| 12 | Jefferson County | 34,854 |
| 13 | Elmore County | 29,729 |
| 14 | Payette County | 27,662 |
| 15 | Jerome County | 26,056 |
| 16 | Cassia County | 25,976 |
| 17 | Blaine County | 25,261 |
| 18 | Minidoka County | 22,691 |
| 19 | Gem County | 21,857 |
| 20 | Idaho County | 17,912 |
| 21 | Gooding County | 16,189 |
| 22 | Franklin County | 15,638 |
| 23 | Fremont County | 14,399 |
| 24 | Shoshone County | 14,074 |
| 25 | Boundary County | 14,040 |
| 26 | Teton County | 12,932 |
| 27 | Valley County | 12,777 |
| 28 | Owyhee County | 12,748 |
| 29 | Washington County | 11,539 |
| 30 | Benewah County | 10,529 |
| 31 | Clearwater County | 9,151 |
| 32 | Boise County | 8,581 |
| 33 | Lemhi County | 8,397 |
| 34 | Power County | 8,381 |
| 35 | Caribou County | 7,239 |
| 36 | Bear Lake County | 6,779 |
| 37 | Lincoln County | 5,556 |
| 38 | Adams County | 4,998 |
| 39 | Oneida County | 4,976 |
| 40 | Custer County | 4,597 |
| 41 | Lewis County | 3,728 |
| 42 | Butte County | 2,735 |
| 43 | Camas County | 1,247 |
| 44 | Clark County | 794 |
|
United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2024. Population Division. May 2025. |
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