Ranking of Washington Counties By Percentage of Non-Hispanic 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 percentage of the Washington Non-Hispanic White Alone population (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 4.74%. Among all Washington counties, Yakima County had the highest percentage of its Non-Hispanic White Alone population (aged 25 years and above) with an educational attainment of Less than High School Diploma (9.79%), followed by Okanogan County (8.94%), and Ferry County (8.89%).

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, and for other races and ethnicities.

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

Ranking of Washington Counties By Percentage of Non-Hispanic White Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Yakima County
Okanogan County
Ferry County
Cowlitz County
Lewis County
Asotin County
Wahkiakum County
Adams County
Grays Harbor County
Grant County
Ranking of Washington Counties By Percentage of Non-Hispanic White Alone 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 Yakima County 9.79
2 Okanogan County 8.94
3 Ferry County 8.89
4 Cowlitz County 8.52
5 Lewis County 8.46
6 Asotin County 8.39
7 Wahkiakum County 7.97
8 Adams County 7.78
9 Grays Harbor County 7.75
10 Grant County 7.48
11 Lincoln County 7.28
12 Skamania County 7.11
13 Stevens County 7.02
14 Columbia County 7.00
15 Mason County 6.96
16 Chelan County 6.84
17 Pacific County 6.72
18 Douglas County 6.64
19 Pend Oreille County 6.31
20 Klickitat County 6.28
21 Kittitas County 6.17
22 Franklin County 5.83
23 Walla Walla County 5.76
24 Clallam County 5.70
25 Garfield County 5.66
25 Pierce County 5.66
26 Benton County 5.12
27 Snohomish County 4.97
28 Clark County 4.94
28 Spokane County 4.94
29 Skagit County 4.90
30 Whatcom County 4.52
31 Thurston County 4.18
32 Whitman County 3.93
33 Kitsap County 3.83
34 Island County 3.76
35 Jefferson County 2.97
36 San Juan County 2.89
37 King County 2.66