Idaho Counties by Population (2025)

by Kristen Carney 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.

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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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