Ranking of Idaho Counties By Population in 2018

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2018, the Population for Idaho was 1.75M. Among all Idaho counties, Ada County had the highest population (469.16K), followed by Canyon County (223.52K), and Kootenai County (161.28K).

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 2018
Ada
Canyon
Kootenai
Bonneville
Bannock
Twin Falls
Bingham
Bonner
Nez Perce
Latah
Ranking of Idaho Counties By Population in 2018
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Rank County Population
1 Ada County 469161
2 Canyon County 223518
3 Kootenai County 161279
4 Bonneville County 116661
5 Bannock County 86761
6 Twin Falls County 86166
7 Bingham County 46054
8 Bonner County 44709
9 Nez Perce County 40408
10 Latah County 39996
11 Madison County 39451
12 Jefferson County 29418
13 Elmore County 27309
14 Jerome County 24078
15 Cassia County 23769
16 Payette County 23560
17 Blaine County 22736
18 Minidoka County 20667
19 Gem County 17622
20 Idaho County 16469
21 Gooding County 15187
22 Franklin County 13718
23 Fremont County 13162
24 Shoshone County 12781
25 Boundary County 12073
26 Owyhee County 11664
27 Teton County 11640
28 Valley County 11054
29 Washington County 10070
30 Benewah County 9222
31 Clearwater County 8759
32 Lemhi County 7974
33 Boise County 7689
34 Power County 7654
35 Caribou County 7019
36 Bear Lake County 6026
37 Lincoln County 5360
38 Oneida County 4429
39 Custer County 4216
40 Adams County 4215
41 Lewis County 3835
42 Butte County 2592
43 Camas County 1098
44 Clark County 845