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King County, Washington

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1,445,755
Active registered voters
2,758
Precincts
5
Presidential cycles of results

Voter file loaded June 9, 2026 · figures are from that file, held as a fixed record

King County, Washington has 1,445,755 active registered voters across 2,758 precincts, as of September 2026.

Party registration

Washington doesn't register voters by party, so there's no party breakdown to show. Party lean is usually inferred from primary participation; that data is in the voter file and available inside Motion51.

How King County voted for president

70.3
28.2
2008
68.8
28.9
2012
72.1
21.7
2016
75.0
22.2
2020
74.1
22.5
2024
■ Democratic %   ■ Republican %  ·  2024 total votes cast: 1,122,881

Election results are public records.

Source:  Official county canvasses via MIT Election Data + Science Lab

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Also see: Motion51 in Washington · How to run for office in King County · Pricing