Marshall County, Iowa: New American county. In 2024, voted R+16%. Republican peak: R+61 in 1920.
Key facts
- 2024 presidential margin
- R+16MIT Election Lab
- Political typology
- New AmericanAkashic typology
- Population
- 40,1142024 5-year
- Median household income
- $73,3152024 5-year
- White (non-Hispanic)
- 70.6%2024 5-year
- Black
- 2.1%2024 5-year
- Hispanic / Latino
- 24.6%2024 5-year
- Peak Democratic margin
- D+22 in 1964MIT Election Lab
- Peak Republican margin
- R+61 in 1920MIT Election Lab
- Most similar
- Poweshiek County, IA · similarity 0.98
2024 results by precinct
2024 precinct map of Marshall CountyPrecinct-level 2024 presidential results for Marshall County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −18.6% |
| 1896 | −26.1% |
| 1900 | −34.0% |
| 1904 | −47.8% |
| 1908 | −30.7% |
| 1912 | +18.4% |
| 1916 | −25.4% |
| 1920 | −60.7% |
| 1924 | −56.6% |
| 1928 | −46.5% |
| 1932 | −1.6% |
| 1936 | −7.7% |
| 1940 | −13.3% |
| 1944 | −13.1% |
| 1948 | −8.5% |
| 1952 | −34.5% |
| 1956 | −27.7% |
| 1960 | −20.6% |
| 1964 | +21.6% |
| 1968 | −18.2% |
| 1972 | −23.6% |
| 1976 | −4.7% |
| 1980 | −18.3% |
| 1984 | −10.2% |
| 1988 | +12.0% |
| 1992 | +8.3% |
| 1996 | +9.5% |
| 2000 | −2.6% |
| 2004 | −0.6% |
| 2008 | +9.4% |
| 2012 | +9.4% |
| 2016 | −8.2% |
| 2020 | −7.7% |
| 2024 | −15.5% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 7,134 | 9,815 | 17,270 | ||
| R | 8,176 | 9,571 | 18,136 | ||
| R | 7,652 | 9,146 | 18,175 | ||
| D | 10,257 | 8,472 | 19,064 | ||
| D | 10,023 | 8,278 | 18,657 | ||
| R | 9,443 | 9,557 | 19,164 | ||
| R | 8,322 | 8,785 | 17,624 | ||
| D | 8,669 | 7,017 | 17,324 | ||
| D | 8,303 | 6,784 | 18,289 | ||
| D | 9,760 | 7,657 | 17,549 | ||
| R | 8,809 | 10,839 | 19,840 | ||
| R | 7,114 | 10,707 | 19,626 | ||
| R | 8,695 | 9,562 | 18,630 | ||
| R | 6,618 | 10,798 | 17,744 | ||
| R | 6,362 | 9,402 | 16,686 | ||
| D | 9,815 | 6,323 | 16,176 | ||
| R | 6,761 | 10,265 | 17,042 | ||
| R | 5,755 | 10,305 | 16,425 | ||
| R | 5,314 | 11,135 | 16,890 | ||
| R | 5,602 | 6,698 | 12,833 | ||
| R | 5,598 | 7,325 | 13,157 | ||
| R | 6,497 | 8,503 | 15,065 | ||
| R | 6,297 | 7,377 | 14,008 | ||
| R | 6,385 | 6,604 | 13,483 | ||
| R | 3,384 | 9,326 | 12,792 | ||
| R | 1,516 | 9,010 | 13,233 | ||
| R | 2,166 | 9,334 | 11,800 | ||
| R | 2,414 | 4,172 | 6,916 | ||
| O | 2,162 | 926 | 6,717 | ||
| R | 1,941 | 3,887 | 6,337 | ||
| R | 1,203 | 4,229 | 6,337 | ||
| R | 2,329 | 4,878 | 7,496 | ||
| R | 2,626 | 4,541 | 7,342 | ||
| R | 2,312 | 3,441 | 6,080 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
23.2%
Irish
9.5%
English
8.9%
American
4.1%
French
1.4%
Scottish
1.1%
Italian
0.7%
African American
1.7%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 38.5 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$73,315
Marshall County ranks near the middle of US counties.
Marshall County$73,315
Iowa$75,059
United States$80,734
Marshall County ranks near the middle of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
11.2%
Children face moderate poverty.
Children under 1816.9%
Working age (18–64)9.0%
Seniors (65+)10.7%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
75.2%
speak English only
Spanish19.6%
Asian & Pacific Islander3.8%
Other languages0.8%
Other Indo-European0.5%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 46.7% of residents not counted as adherents by any reporting body.
Marshall County's population centers on Marshalltown, a meatpacking hub with one of Iowa's largest Latino immigrant communities, yet the county has moved roughly 20 points toward Republicans over the past two presidential cycles.
Marshall County has leaned Republican in recent presidential elections, reaching a Democratic margin of twenty-two points in 1964. Between 2020 and 2024 it moved eight points toward the Republican candidate — part of the sharpest rightward shift recorded among any group of places in the country.
Its demographics describe the shift: a 71% non-Hispanic-white share, a median household income of $73,315, and a population of 40,114. The county's voting pattern over the last decade is most similar to that of Poweshiek County and Conejos County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Marshall County, Iowa. Akashic. https://akashic.app/county/19127/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions
How did Marshall County, Iowa vote in 2024?
In 2024, Marshall County, Iowa voted Republican by 15.5 points (R+16), carried by the Republican candidate. Out of 17,270 votes cast, 7,134 went Democratic and 9,815 went Republican.
What is Marshall County, Iowa's political typology?
Akashic places Marshall County, Iowa in the "New American" typology — Communities where a large share of households speak a language other than English — multilingual, Democratic-leaning overall, yet the hardest-swinging bloc toward the Republican Party in 2024. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 6 times, Republican 27 times, and other 1 times.
When did Marshall County, Iowa last vote Democratic?
The most recent presidential election in which Marshall County, Iowa voted Democratic was 2012.
How many people live in Marshall County, Iowa?
Marshall County, Iowa has a population of 40,114 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Marshall County, Iowa?
Median household income in Marshall County, Iowa is $73,315 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Marshall County, Iowa?
Akashic tracks 38 presidential elections in Marshall County, Iowa from 1876 to 2024. Of those, 6 went Democratic and 27 went Republican. The county's typology — "New American" — captures where that record, its demographics, and its recent swing place it among American communities.