Iowa·IA·FIPS 19061

Dubuque County

Voted Republican in 2024 · 53,057 votes cast

About Dubuque County

Dubuque County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 99,266, and was estimated to be 99,381 in 2025, making it the ninth-most populous county in Iowa. The county seat is Dubuque. The county is named for Julien Dubuque, the first European settler of Iowa. Dubuque County comprises the Dubuque, Iowa Metropolitan statistical area.

2024 Presidential Results

All candidates · Dubuque County, Iowa

Donald J Trump(Republican)

106.4%56,448

Won by 18,487 votes

Kamala D Harris(Democrat)

71.5%37,961

Other(Other)

3.5%1,850

Chase Oliver(Libertarian)

0.8%406

Margin History

Red = Republican, Blue = Democratic

2024R+19.1

2020R+3.2

2016R+1.2

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Swung Right in 2024

Dubuque County shifted 16.0 points toward Republicans compared to 2020. Voter turnout decreased by 1.6%.

Dubuque County — Local Discussion

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What does Dubuque County really think?

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