Ranking of Idaho Counties By White Alone Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)

Updated on September 5, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the Idaho White Alone population (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 74,074. Among all Idaho counties, Ada County had the highest White Alone population (aged 25 years and above) with an educational attainment of Less than High School Diploma (12,184), followed by Canyon County (10,755), and Kootenai County (6,658).

The chart below shows the top 10 Idaho counties, and the table below shows the ranking of all Idaho counties.

You can see similar information for other educational attainments, and for other races and ethnicities.

You can also see similar information for other states and for the United States.

Ranking of Idaho Counties By White Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Ada County
Canyon County
Kootenai County
Twin Falls County
Bonneville County
Bannock County
Bonner County
Jerome County
Minidoka County
Nez Perce County
Ranking of Idaho Counties By White Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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Rank County Number of People
1 Ada County 12184
2 Canyon County 10755
3 Kootenai County 6658
4 Twin Falls County 5658
5 Bonneville County 3615
6 Bannock County 2675
7 Bonner County 2539
8 Jerome County 2323
9 Minidoka County 1975
10 Nez Perce County 1835
11 Gooding County 1673
12 Cassia County 1612
13 Bingham County 1477
14 Payette County 1284
15 Gem County 1154
16 Owyhee County 1115
17 Jefferson County 1055
18 Shoshone County 1039
19 Elmore County 1022
20 Blaine County 951
21 Idaho County 927
22 Boundary County 919
23 Benewah County 829
24 Fremont County 792
25 Valley County 772
26 Latah County 725
27 Madison County 668
28 Power County 586
29 Washington County 559
30 Lemhi County 551
31 Franklin County 527
32 Clearwater County 463
33 Lincoln County 452
34 Caribou County 401
35 Custer County 394
36 Teton County 293
37 Boise County 277
38 Bear Lake County 258
39 Oneida County 244
40 Adams County 229
41 Lewis County 196
42 Butte County 177
43 Camas County 140
44 Clark County 96