Missouri·MO·FIPS 29189

St Louis County

Voted Democratic in 2024 · 502,738 votes cast

About St Louis County

St. Louis County is located in eastern Missouri. It is bounded by the City of St. Louis and the Mississippi River to the east, the Missouri River to the north, and the Meramec River to the south. As of the 2020 census, the population was 1,004,125, making it the most populous county in Missouri, and was estimated to be 987,059 in 2023. Its county seat is Clayton, while the largest city is Florissant. The county is included in the St. Louis, MO–IL metropolitan statistical area.

2024 Presidential Results

All candidates · St Louis County, Missouri

Kamala D Harris(Democrat)

60.8%305,635

Won by 117,653 votes

Donald J Trump(Republican)

37.4%187,982

Other(Other)

0.9%4,632

Chase Oliver(Libertarian)

0.9%4,489

Margin History

Red = Republican, Blue = Democratic

2024D+23.4

2020D+24.0

2016D+16.4

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Swung Right in 2024

St Louis County shifted 0.6 points toward Republicans compared to 2020. Voter turnout decreased by 6.3%.

St Louis County — Local Discussion

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What does St Louis County really think?

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