Illinois·IL·FIPS 17163

St. Clair County

Voted Democratic in 2024 · 119,962 votes cast

About St. Clair County

St. Clair County is the ninth most populous county in Illinois. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois. As of the 2020 United States census, St. Clair County had a population of 257,400, making it the second most populous county in Illinois outside the Northern Third. Belleville is the county seat and largest city.

2024 Presidential Results

All candidates · St. Clair County, Illinois

Kamala D Harris(Democrat)

52.9%63,433

Won by 9,412 votes

Donald J Trump(Republican)

45.0%54,021

Other(Other)

2.0%2,441

Chase Oliver(Libertarian)

0.1%67

Margin History

Red = Republican, Blue = Democratic

2024D+7.8

2020D+8.7

2016D+5.7

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Swung Right in 2024

St. Clair County shifted 0.9 points toward Republicans compared to 2020. Voter turnout decreased by 6.3%.

St. Clair County — Local Discussion

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What does St. Clair County really think?

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