Ranking of Idaho Counties By Population in 2021

Updated on August 1, 2024.

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 (513.03K), followed by Canyon County (243.71K), and Kootenai County (180.06K).

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.

See this for other years:
Ranking of Idaho Counties By Population in 2021
Ada
Canyon
Kootenai
Bonneville
Twin Falls
Bannock
Madison
Bonner
Bingham
Nez Perce
Ranking of Idaho Counties By Population in 2021
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Rank County Population
1 Ada County 513025
2 Canyon County 243710
3 Kootenai County 180058
4 Bonneville County 128064
5 Twin Falls County 92394
6 Bannock County 88515
7 Madison County 54092
8 Bonner County 49633
9 Bingham County 48929
10 Nez Perce County 42500
11 Latah County 40400
12 Jefferson County 32201
13 Elmore County 28978
14 Payette County 26386
15 Cassia County 25244
16 Blaine County 24782
17 Jerome County 24738
18 Minidoka County 21944
19 Gem County 19802
20 Idaho County 17059
21 Gooding County 15793
22 Franklin County 14670
23 Shoshone County 13615
24 Fremont County 13591
25 Boundary County 12620
26 Owyhee County 12356
27 Teton County 12273
28 Valley County 12256
29 Washington County 10900
30 Benewah County 9895
31 Clearwater County 8925
32 Lemhi County 8160
33 Boise County 8133
34 Power County 7975
35 Caribou County 7109
36 Bear Lake County 6567
37 Lincoln County 5285
38 Adams County 4623
39 Oneida County 4605
40 Custer County 4446
41 Lewis County 3690
42 Butte County 2666
43 Camas County 1137
44 Clark County 793