Ranking of Idaho Counties By Percentage of Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the population of Idaho (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 8.83%. Among all Idaho counties, Clark County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (34.62%), followed by Owyhee County (25.14%), and Jerome County (23.69%).
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.
You can also see similar information for other states and for the United States.
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Related Topics: Idaho ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Idaho Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Clark County | 34.62 |
| 2 | Owyhee County | 25.14 |
| 3 | Jerome County | 23.69 |
| 4 | Gooding County | 22.83 |
| 5 | Minidoka County | 20.89 |
| 6 | Power County | 20.55 |
| 7 | Camas County | 20.47 |
| 8 | Lincoln County | 18.66 |
| 9 | Cassia County | 15.69 |
| 10 | Benewah County | 14.19 |
| 11 | Payette County | 13.86 |
| 12 | Canyon County | 13.48 |
| 13 | Custer County | 12.99 |
| 14 | Twin Falls County | 12.97 |
| 15 | Gem County | 12.20 |
| 16 | Washington County | 12.19 |
| 17 | Boundary County | 11.72 |
| 18 | Shoshone County | 11.60 |
| 19 | Fremont County | 11.46 |
| 20 | Butte County | 10.78 |
| 21 | Elmore County | 10.75 |
| 22 | Bingham County | 10.68 |
| 23 | Caribou County | 10.31 |
| 24 | Lemhi County | 10.04 |
| 25 | Lewis County | 10.03 |
| 26 | Blaine County | 9.98 |
| 27 | Oneida County | 9.91 |
| 28 | Valley County | 9.45 |
| 29 | Jefferson County | 8.21 |
| 30 | Bonner County | 8.10 |
| 31 | Idaho County | 7.85 |
| 32 | Teton County | 7.61 |
| 33 | Clearwater County | 7.57 |
| 34 | Adams County | 7.50 |
| 34 | Bonneville County | 7.50 |
| 35 | Franklin County | 7.25 |
| 36 | Bear Lake County | 6.89 |
| 37 | Nez Perce County | 6.84 |
| 38 | Bannock County | 6.71 |
| 39 | Kootenai County | 6.46 |
| 40 | Boise County | 5.29 |
| 41 | Ada County | 4.97 |
| 42 | Madison County | 4.39 |
| 43 | Latah County | 3.48 |