Ranking of Washington Counties By Percentage of White Alone Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent in 2021 (ACS-5Yrs)

Updated on September 5, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the Washington White Alone population (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 22.10%. Among all Washington counties, Grays Harbor County had the highest percentage of its White Alone population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (34.96%), followed by Stevens County (34.46%), and Ferry County (34.30%).

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 White Alone Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
Grays Harbor County
Stevens County
Ferry County
Skamania County
Cowlitz County
Pend Oreille County
Adams County
Mason County
Wahkiakum County
Lewis County
Ranking of Washington Counties By Percentage of White Alone Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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Rank County Percentage of Population (Aged 25yrs+) (%)
1 Grays Harbor County 34.96
2 Stevens County 34.46
3 Ferry County 34.30
4 Skamania County 32.66
5 Cowlitz County 31.74
6 Pend Oreille County 31.71
7 Adams County 31.47
8 Mason County 30.86
9 Wahkiakum County 30.85
10 Lewis County 30.59
11 Douglas County 30.47
12 Okanogan County 29.33
13 Grant County 29.10
14 Pacific County 28.65
15 Asotin County 28.45
16 Yakima County 27.38
17 Klickitat County 26.78
18 Lincoln County 26.75
19 Pierce County 26.03
20 Kittitas County 25.88
21 Franklin County 25.80
22 Clark County 25.41
23 Skagit County 25.19
24 Chelan County 25.16
25 Clallam County 24.75
26 Snohomish County 24.32
27 Garfield County 23.08
28 Spokane County 22.89
29 Benton County 22.61
30 Island County 21.89
31 Columbia County 21.71
32 Whatcom County 21.58
33 Thurston County 21.26
34 Kitsap County 21.09
35 Walla Walla County 20.55
36 Jefferson County 20.50
37 Whitman County 16.38
38 San Juan County 15.64
39 King County 14.07