Ranking of Idaho Counties By 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 population of Idaho (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 104,683. Among all Idaho counties, Canyon County had the highest population (aged 25 years and above) with an educational attainment of Less than High School Diploma (19,140), followed by Ada County (16,433), and Kootenai County (7,584).
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 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 | Canyon County | 19140 |
| 2 | Ada County | 16433 |
| 3 | Kootenai County | 7584 |
| 4 | Twin Falls County | 7392 |
| 5 | Bonneville County | 5552 |
| 6 | Bannock County | 3696 |
| 7 | Jerome County | 3493 |
| 8 | Bingham County | 3067 |
| 9 | Bonner County | 2812 |
| 10 | Minidoka County | 2776 |
| 11 | Payette County | 2282 |
| 12 | Cassia County | 2281 |
| 13 | Gooding County | 2261 |
| 14 | Nez Perce County | 1995 |
| 15 | Owyhee County | 1965 |
| 16 | Elmore County | 1923 |
| 17 | Blaine County | 1693 |
| 18 | Gem County | 1603 |
| 19 | Jefferson County | 1437 |
| 20 | Shoshone County | 1107 |
| 21 | Fremont County | 1012 |
| 22 | Power County | 1006 |
| 23 | Boundary County | 963 |
| 24 | Idaho County | 958 |
| 24 | Madison County | 958 |
| 25 | Benewah County | 957 |
| 26 | Washington County | 900 |
| 27 | Valley County | 850 |
| 28 | Latah County | 803 |
| 29 | Lincoln County | 623 |
| 30 | Franklin County | 608 |
| 31 | Lemhi County | 607 |
| 32 | Teton County | 604 |
| 33 | Clearwater County | 520 |
| 34 | Caribou County | 460 |
| 35 | Custer County | 423 |
| 36 | Boise County | 317 |
| 37 | Oneida County | 291 |
| 38 | Bear Lake County | 283 |
| 39 | Lewis County | 259 |
| 40 | Adams County | 257 |
| 41 | Butte County | 205 |
| 42 | Clark County | 180 |
| 43 | Camas County | 147 |