Iowa·IA·FIPS 19101

Jefferson County

Voted Republican in 2024 · 8,454 votes cast

About Jefferson County

Jefferson County is a county located in the U.S. state of Iowa. As of the 2020 United States census, the population was 15,663. The county seat is Fairfield. The county was formed in January 1839, and was named for U.S. President Thomas Jefferson. Jefferson County comprises the Fairfield, IA Micropolitan Statistical Area.

2024 Presidential Results

All candidates · Jefferson County, Iowa

Donald J Trump(Republican)

103.0%8,706

Won by 1,130 votes

Kamala D Harris(Democrat)

89.6%7,576

Undervotes(Other)

6.4%540

Chase Oliver(Libertarian)

1.0%86

Margin History

Red = Republican, Blue = Democratic

2024R+6.7

2020R+1.8

2016R+0.5

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Swung Right in 2024

Jefferson County shifted 4.9 points toward Republicans compared to 2020. Voter turnout decreased by 5.6%.

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)