Ranking of Oregon 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 Oregon (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 8.50%. Among all Oregon counties, Morrow County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (22.54%), followed by Malheur County (18.51%), and Umatilla County (16.76%).
The chart below shows the top 10 Oregon counties, and the table below shows the ranking of all Oregon 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: Oregon ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Oregon 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 | Morrow County | 22.54 |
| 2 | Malheur County | 18.51 |
| 3 | Umatilla County | 16.76 |
| 4 | Hood River County | 16.75 |
| 5 | Marion County | 14.33 |
| 6 | Lake County | 13.95 |
| 7 | Wasco County | 12.98 |
| 8 | Sherman County | 12.69 |
| 9 | Jefferson County | 12.16 |
| 10 | Klamath County | 11.63 |
| 11 | Wheeler County | 10.40 |
| 12 | Coos County | 10.04 |
| 13 | Yamhill County | 9.89 |
| 14 | Linn County | 9.82 |
| 15 | Columbia County | 9.55 |
| 16 | Douglas County | 9.46 |
| 16 | Grant County | 9.46 |
| 17 | Tillamook County | 9.33 |
| 18 | Harney County | 9.32 |
| 19 | Baker County | 9.22 |
| 20 | Josephine County | 9.19 |
| 21 | Crook County | 9.16 |
| 22 | Jackson County | 9.13 |
| 23 | Polk County | 8.43 |
| 24 | Curry County | 8.09 |
| 25 | Clatsop County | 7.87 |
| 26 | Multnomah County | 7.63 |
| 27 | Lincoln County | 7.26 |
| 28 | Union County | 7.25 |
| 29 | Lane County | 7.11 |
| 30 | Washington County | 7.01 |
| 31 | Gilliam County | 6.56 |
| 32 | Wallowa County | 5.99 |
| 33 | Deschutes County | 5.67 |
| 34 | Clackamas County | 5.66 |
| 35 | Benton County | 3.71 |