Ranking of Washington Counties By 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. Among all Washington counties, King County had the highest population with Unclassified ancestry (345.62K), followed by Pierce County (202.29K), and Snohomish County (164.03K).

The chart and table below shows the top 10 counties with high number of people with 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 Population with Unclassified Ancestry in 2021
King County
Pierce County
Snohomish County
Spokane County
Clark County
Thurston County
Whatcom County
Kitsap County
Yakima County
Benton County
Ranking of Washington Counties By Population with Unclassified Ancestry in 2021
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Rank County Population
1 King County 345624
2 Pierce County 202287
3 Snohomish County 164027
4 Spokane County 129898
5 Clark County 111378
6 Thurston County 61814
7 Whatcom County 53379
8 Kitsap County 52204
9 Yakima County 42728
10 Benton County 37719
11 Cowlitz County 26450
12 Skagit County 26274
13 Franklin County 22396
14 Grant County 20742
15 Grays Harbor County 18823
16 Lewis County 18578
17 Island County 17727
18 Clallam County 16205
19 Mason County 14180
20 Walla Walla County 13215
21 Kittitas County 11366
22 Chelan County 10814
23 Whitman County 9605
24 Stevens County 9039
25 Okanogan County 7428
26 Asotin County 7091
27 Jefferson County 5733
28 Pacific County 5697
29 Douglas County 5494
30 San Juan County 3801
31 Adams County 3745
32 Klickitat County 3628
33 Pend Oreille County 3595
34 Skamania County 2605
35 Lincoln County 1778
36 Wahkiakum County 1624
37 Ferry County 1201
38 Columbia County 1015
39 Garfield County 632