Illinois·IL·FIPS 17081

Jefferson County

Voted Republican in 2024 · 16,662 votes cast

About Jefferson County

Jefferson County is a county located in the southern part of the U.S. state of Illinois. According to the 2020 census, it has a population of 37,113. The county seat is Mount Vernon. Jefferson County contains the Mount Vernon, Illinois micropolitan area. It is located in the southern portion known locally as "Little Egypt". The western border of the county adjoins the Greater St. Louis consolidated metropolitan statistical area, the Metro-East region, and the St. Louis commuter region and market and viewing area.

2024 Presidential Results

All candidates · Jefferson County, Illinois

Donald J Trump(Republican)

73.2%12,189

Won by 7,949 votes

Kamala D Harris(Democrat)

25.4%4,240

Other(Other)

1.4%233

Chase Oliver(Libertarian)

0.0%0

Margin History

Red = Republican, Blue = Democratic

2024R+47.7

2020R+45.2

2016R+42.8

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Swung Right in 2024

Jefferson County shifted 2.5 points toward Republicans compared to 2020. Voter turnout decreased by 4.3%.

Jefferson County — Local Discussion

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What does Jefferson County really think?

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