Ranking of Washington Counties By Percentage of Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent 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 Washington (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 21.79%. Among all Washington counties, Grays Harbor County had the highest percentage of its population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (35.05%), followed by Stevens County (34.48%), and Ferry County (33.50%).
The chart below shows the top 10 Washington counties, and the table below shows the ranking of all Washington counties.
You can see similar information for other educational attainments.
You can also see similar information for other states and for the United States.
You may also be interested in:
Related Topics: Washington ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Washington Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
25
0 of 0
| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Grays Harbor County | 35.05 |
| 2 | Stevens County | 34.48 |
| 3 | Ferry County | 33.50 |
| 4 | Pend Oreille County | 31.99 |
| 5 | Skamania County | 31.95 |
| 6 | Cowlitz County | 31.03 |
| 7 | Mason County | 30.81 |
| 8 | Adams County | 30.68 |
| 9 | Lewis County | 30.09 |
| 10 | Wahkiakum County | 29.74 |
| 11 | Douglas County | 29.48 |
| 12 | Pacific County | 29.26 |
| 13 | Okanogan County | 28.86 |
| 14 | Asotin County | 28.10 |
| 15 | Grant County | 28.06 |
| 16 | Lincoln County | 27.34 |
| 17 | Yakima County | 27.18 |
| 18 | Klickitat County | 26.79 |
| 19 | Pierce County | 26.47 |
| 20 | Skagit County | 25.53 |
| 21 | Franklin County | 25.23 |
| 22 | Kittitas County | 25.11 |
| 23 | Clallam County | 24.96 |
| 24 | Clark County | 24.91 |
| 25 | Chelan County | 24.65 |
| 26 | Garfield County | 23.68 |
| 27 | Snohomish County | 23.27 |
| 28 | Spokane County | 23.20 |
| 29 | Benton County | 23.18 |
| 30 | Island County | 21.88 |
| 31 | Whatcom County | 21.82 |
| 32 | Thurston County | 21.76 |
| 33 | Jefferson County | 21.30 |
| 34 | Walla Walla County | 21.24 |
| 35 | Kitsap County | 21.18 |
| 36 | Columbia County | 20.15 |
| 37 | San Juan County | 16.41 |
| 38 | Whitman County | 15.33 |
| 39 | King County | 14.84 |