Carroll County, Iowa: Heartland Swing county. In 2024, voted R+42%. Democratic peak: D+53 in 1964.
Key facts
- 2024 presidential margin
- R+42MIT Election Lab
- Political typology
- Heartland SwingAkashic typology
- Population
- 20,5942024 5-year
- Median household income
- $72,9302024 5-year
- White (non-Hispanic)
- 92.9%2024 5-year
- Black
- 0.7%2024 5-year
- Hispanic / Latino
- 3.5%2024 5-year
- Peak Democratic margin
- D+53 in 1964MIT Election Lab
- Peak Republican margin
- R+48 in 1920MIT Election Lab
- Most similar
- Hardin County, IA · similarity 0.99
2024 results by precinct
2024 precinct map of Carroll CountyPrecinct-level 2024 presidential results for Carroll County, with each precinct boundary colored by Democratic-vs-Republican margin.
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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 | +19.2% |
| 1896 | +7.8% |
| 1900 | +4.5% |
| 1904 | −5.6% |
| 1908 | +14.5% |
| 1912 | +38.8% |
| 1916 | −7.1% |
| 1920 | −47.8% |
| 1924 | −18.3% |
| 1928 | +20.8% |
| 1932 | +51.7% |
| 1936 | +28.8% |
| 1940 | +1.4% |
| 1944 | −0.4% |
| 1948 | +17.7% |
| 1952 | −28.7% |
| 1956 | −6.7% |
| 1960 | +20.6% |
| 1964 | +53.1% |
| 1968 | +9.6% |
| 1972 | +2.1% |
| 1976 | +12.9% |
| 1980 | −11.6% |
| 1984 | −0.6% |
| 1988 | +18.7% |
| 1992 | +3.8% |
| 1996 | +10.7% |
| 2000 | −4.3% |
| 2004 | −10.2% |
| 2008 | +3.7% |
| 2012 | −6.1% |
| 2016 | −31.2% |
| 2020 | −37.8% |
| 2024 | −41.8% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 3,153 | 7,814 | 11,140 | ||
| R | 3,454 | 7,737 | 11,335 | ||
| R | 3,309 | 6,638 | 10,682 | ||
| R | 4,947 | 5,601 | 10,674 | ||
| D | 5,302 | 4,922 | 10,387 | ||
| R | 4,689 | 5,762 | 10,524 | ||
| R | 4,463 | 4,879 | 9,568 | ||
| D | 4,333 | 3,392 | 8,790 | ||
| D | 3,800 | 3,439 | 9,475 | ||
| D | 5,437 | 3,701 | 9,273 | ||
| R | 4,960 | 5,021 | 10,077 | ||
| R | 3,885 | 5,017 | 9,737 | ||
| D | 5,333 | 4,094 | 9,608 | ||
| D | 4,608 | 4,415 | 9,285 | ||
| D | 4,809 | 3,927 | 9,202 | ||
| D | 7,807 | 2,387 | 10,207 | ||
| D | 7,064 | 4,648 | 11,721 | ||
| R | 5,085 | 5,816 | 10,913 | ||
| R | 4,139 | 7,473 | 11,628 | ||
| D | 5,711 | 3,974 | 9,786 | ||
| R | 4,799 | 4,833 | 9,659 | ||
| D | 5,526 | 5,376 | 10,923 | ||
| D | 6,285 | 3,259 | 10,503 | ||
| D | 7,174 | 2,265 | 9,499 | ||
| D | 6,134 | 4,014 | 10,169 | ||
| R | 1,994 | 3,590 | 8,744 | ||
| R | 2,174 | 6,320 | 8,671 | ||
| R | 2,085 | 2,408 | 4,535 | ||
| D | 2,326 | 664 | 4,282 | ||
| D | 2,510 | 1,865 | 4,448 | ||
| R | 2,040 | 2,290 | 4,471 | ||
| D | 2,434 | 2,224 | 4,698 | ||
| D | 2,417 | 2,066 | 4,524 | ||
| D | 2,375 | 1,592 | 4,082 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
51.6%
Irish
13.3%
English
6.0%
American
5.1%
French
1.2%
Italian
1.1%
Scottish
1.1%
Sample size too small to break out by ancestry reliably.
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
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: 41.1 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
$72,930
Carroll County ranks near the middle of US counties.
Carroll County$72,930
Iowa$75,059
United States$80,734
Carroll 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
7.9%
Child poverty is below the national average.
Children under 185.5%
Working age (18–64)8.4%
Seniors (65+)11.8%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
98.0%
speak English only
Spanish1.6%
Other Indo-European0.4%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 18.0% of residents not counted as adherents by any reporting body.
Carroll County's farming communities have shifted decisively Republican over the past decade, with the 2024 presidential margin exceeding 40 points — a pattern consistent with broader rural Iowa realignment away from its historically competitive roots.
The Democratic margin here peaked at fifty-three points in 1964. Between 2020 and 2024 the county moved four points toward the Republican candidate; the 2024 margin was forty-two points.
A population of 20,594, a 93% non-Hispanic-white share, and a median household income of $72,930 describe the county. The county's voting pattern over the last decade is most similar to that of Hardin County and Audubon 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.
Carroll County, Iowa. Akashic. https://akashic.app/county/19027/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More heartland swing counties
Frequently asked questions
How did Carroll County, Iowa vote in 2024?
In 2024, Carroll County, Iowa voted Republican by 41.8 points (R+42), carried by the Republican candidate. Out of 11,140 votes cast, 3,153 went Democratic and 7,814 went Republican.
What is Carroll County, Iowa's political typology?
Akashic places Carroll County, Iowa in the "Heartland Swing" typology — Industrial Midwest swing counties drifting steadily toward the Republican Party. 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 19 times, Republican 15 times, and other 0 times.
When did Carroll County, Iowa last vote Democratic?
The most recent presidential election in which Carroll County, Iowa voted Democratic was 2008.
How many people live in Carroll County, Iowa?
Carroll County, Iowa has a population of 20,594 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Carroll County, Iowa?
Median household income in Carroll County, Iowa is $72,930 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Carroll County, Iowa?
Akashic tracks 38 presidential elections in Carroll County, Iowa from 1876 to 2024. Of those, 19 went Democratic and 15 went Republican. The county's typology — "Heartland Swing" — captures where that record, its demographics, and its recent swing place it among American communities.