Marshall County
Voted Republican in 2024 · 17,406 votes cast
About Marshall County
Marshall County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 40,105, and was estimated to be 39,890 in 2025. The county seat and largest city is Marshalltown. The county was formed on January 13, 1846, and named after John Marshall, Chief Justice of the United States Supreme Court. Marshall County comprises the Marshalltown, Iowa Micropolitan Statistical Area. In 2010, the center of population of Iowa was located in Marshall County, near Melbourne.
Read more on Wikipedia →2024 Presidential Results
All candidates · Marshall County, Iowa
Margin History
Red = Republican, Blue = Democratic
Swung Right in 2024
Marshall County shifted 7.5 points toward Republicans compared to 2020. Voter turnout decreased by 4.0%.
What does Marshall County really think?
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Election data: MIT Election Data Science Lab, Harvard Dataverse (CC BY 4.0)