Ranking of Washington Counties By Percentage of Population with Unclassified Ancestry in 2021

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.49M people in Washington with Unclassified ancestry (19.58% of Washington population). Among all Washington counties, Wahkiakum County had the highest percentage of its population with Unclassified ancestry (37.14%), followed by Asotin County (31.82%), and Garfield County (27.74%).

The chart and table below shows the top 10 counties with high percentage of its population having Unclassified ancestry.

You can see similar information for other states and for other ancestry groups in Washington.

Data Source: US Census Bureau.
Ranking of Washington Counties By Percentage of Population with Unclassified Ancestry in 2021
Wahkiakum County
Asotin County
Garfield County
Pend Oreille County
Kittitas County
Columbia County
Grays Harbor County
Pacific County
Spokane County
Cowlitz County
Ranking of Washington Counties By Percentage of Population with Unclassified Ancestry in 2021
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Rank County Percentage of Pop. (%)
1 Wahkiakum County 37.14
2 Asotin County 31.82
3 Garfield County 27.74
4 Pend Oreille County 27.03
5 Kittitas County 25.75
6 Columbia County 25.57
7 Grays Harbor County 25.19
8 Pacific County 24.80
9 Spokane County 24.44
10 Cowlitz County 24.17
11 Whatcom County 23.77
12 Franklin County 23.50
13 Lewis County 22.88
14 Clark County 22.43
15 Pierce County 22.22
16 Mason County 21.83
17 Skamania County 21.76
18 San Juan County 21.56
19 Thurston County 21.27
20 Walla Walla County 21.26
21 Grant County 21.19
22 Clallam County 21.12
23 Island County 20.63
24 Skagit County 20.49
25 Snohomish County 20.00
26 Whitman County 19.93
27 Stevens County 19.63
28 Kitsap County 19.12
29 Benton County 18.44
30 Adams County 18.40
31 Okanogan County 17.70
32 Jefferson County 17.59
33 Yakima County 16.75
34 Ferry County 16.68
35 Lincoln County 16.47
36 Klickitat County 16.14
37 King County 15.42
38 Chelan County 13.77
39 Douglas County 12.89