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California·CA·FIPS 06081

San Mateo County

Voted Democratic in 2024 · 330,510 votes cast

San Mateo County

About San Mateo County

San Mateo County, officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2020 United States census, the population was 764,442. Redwood City is the county seat, the third-most populated city in the county after Daly City and San Mateo.

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Total Votes (2024)
330,510
Winner Margin
D+50.3
Turnout Change
-11.7%
2020→2024 Swing
R+7.4

2024 Presidential Results

All candidates · San Mateo County, California

Kamala D Harris(Democrat)
73.5%242,957
Won by 166,341 votes
Donald J Trump(Republican)
23.2%76,616
Other(Other)
2.8%9,250
Chase Oliver(Libertarian)
0.5%1,687

Margin History

Red = Republican, Blue = Democratic

2024D+50.3
2020D+57.7
2016D+57.2
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Swung Right in 2024

San Mateo County shifted 7.4 points toward Republicans compared to 2020. Voter turnout decreased by 11.7%.

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No one has claimed San Mateo County yet

Be the first citizen to represent your county in the Citizens' Assembly. Your vote will shift San Mateo County's position on the national map.

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San Mateo County — Local Discussion

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What does San Mateo County really think?

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Election data: MIT Election Data Science Lab, Harvard Dataverse (CC BY 4.0)