Adams County, Iowa: Heartland Swing county. In 2024, voted R+44%. Republican peak: R+44 in 2024.
Key facts
- 2024 presidential margin
- R+44MIT Election Lab
- Political typology
- Heartland SwingAkashic typology
- Population
- 3,6222024 5-year
- Median household income
- $71,8752024 5-year
- White (non-Hispanic)
- 94.8%2024 5-year
- Black
- 0.3%2024 5-year
- Hispanic / Latino
- 1.7%2024 5-year
- Peak Democratic margin
- D+19 in 1964MIT Election Lab
- Peak Republican margin
- R+44 in 2020MIT Election Lab
- Most similar
- Crawford County, IA · similarity 0.99
2024 results by precinct
2024 precinct map of Adams CountyPrecinct-level 2024 presidential results for Adams 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 | −13.2% |
| 1896 | −1.0% |
| 1900 | −13.1% |
| 1904 | −25.4% |
| 1908 | −9.0% |
| 1912 | +10.9% |
| 1916 | −1.3% |
| 1920 | −25.8% |
| 1924 | −35.2% |
| 1928 | −33.0% |
| 1932 | +7.7% |
| 1936 | −13.4% |
| 1940 | −20.7% |
| 1944 | −15.2% |
| 1948 | −8.1% |
| 1952 | −38.5% |
| 1956 | −12.2% |
| 1960 | −14.2% |
| 1964 | +19.0% |
| 1968 | −28.0% |
| 1972 | −21.4% |
| 1976 | +4.1% |
| 1980 | −28.1% |
| 1984 | −16.4% |
| 1988 | +8.5% |
| 1992 | +6.6% |
| 1996 | +6.4% |
| 2000 | −12.7% |
| 2004 | −14.6% |
| 2008 | +3.3% |
| 2012 | −3.7% |
| 2016 | −38.9% |
| 2020 | −43.5% |
| 2024 | −44.1% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 576 | 1,517 | 2,135 | ||
| R | 590 | 1,530 | 2,160 | ||
| R | 565 | 1,395 | 2,131 | ||
| R | 1,028 | 1,108 | 2,185 | ||
| D | 1,118 | 1,046 | 2,206 | ||
| R | 977 | 1,317 | 2,325 | ||
| R | 897 | 1,170 | 2,145 | ||
| D | 1,070 | 920 | 2,326 | ||
| D | 1,034 | 863 | 2,596 | ||
| D | 1,283 | 1,080 | 2,380 | ||
| R | 1,221 | 1,706 | 2,960 | ||
| R | 940 | 1,779 | 2,984 | ||
| D | 1,507 | 1,388 | 2,937 | ||
| R | 1,161 | 1,814 | 3,045 | ||
| R | 993 | 1,868 | 3,128 | ||
| D | 1,941 | 1,321 | 3,263 | ||
| R | 1,643 | 2,185 | 3,828 | ||
| R | 1,756 | 2,248 | 4,020 | ||
| R | 1,383 | 3,129 | 4,531 | ||
| R | 1,817 | 2,142 | 4,012 | ||
| R | 1,868 | 2,540 | 4,413 | ||
| R | 2,088 | 3,182 | 5,292 | ||
| R | 2,249 | 2,953 | 5,268 | ||
| D | 2,097 | 1,795 | 3,939 | ||
| R | 1,479 | 2,958 | 4,479 | ||
| R | 897 | 2,547 | 4,692 | ||
| R | 1,670 | 2,845 | 4,557 | ||
| R | 1,365 | 1,401 | 2,791 | ||
| D | 1,215 | 913 | 2,783 | ||
| R | 1,325 | 1,595 | 3,008 | ||
| R | 1,003 | 1,761 | 2,989 | ||
| R | 1,428 | 1,873 | 3,392 | ||
| R | 1,701 | 1,736 | 3,488 | ||
| R | 1,149 | 1,533 | 2,902 | ||
| — | — | — | — | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
27.8%
English
18.0%
Irish
14.3%
American
7.3%
Scottish
2.5%
Italian
1.4%
French
1.2%
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: 46.3 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
$71,875
Adams County ranks near the middle of US counties.
Adams County$71,875
Iowa$75,059
United States$80,734
Adams 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
9.1%
Child poverty is below the national average.
Children under 186.8%
Working age (18–64)10.4%
Seniors (65+)5.4%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
97.5%
speak English only
Spanish1.8%
Other Indo-European0.7%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 61.0% of residents not counted as adherents by any reporting body.
Adams County's population has contracted for decades, leaving a rural electorate that has shifted decisively toward Republican presidential candidates, posting a 44-point margin in 2024 — among the widest in the state.
The Democratic margin here peaked at nineteen points in 1964. Between 2020 and 2024 the county moved one point toward the Republican candidate; the 2024 margin was forty-four points.
A population of 3,622, a 95% non-Hispanic-white share, and a median household income of $71,875 describe the county. The county's voting pattern over the last decade is most similar to that of Crawford County and Murray 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.
Adams County, Iowa. Akashic. https://akashic.app/county/19003/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More heartland swing counties
Frequently asked questions
How did Adams County, Iowa vote in 2024?
In 2024, Adams County, Iowa voted Republican by 44.1 points (R+44), carried by the Republican candidate. Out of 2,135 votes cast, 576 went Democratic and 1,517 went Republican.
What is Adams County, Iowa's political typology?
Akashic places Adams 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 8 times, Republican 26 times, and other 0 times.
When did Adams County, Iowa last vote Democratic?
The most recent presidential election in which Adams County, Iowa voted Democratic was 2008.
How many people live in Adams County, Iowa?
Adams County, Iowa has a population of 3,622 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Adams County, Iowa?
Median household income in Adams County, Iowa is $71,875 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Adams County, Iowa?
Akashic tracks 38 presidential elections in Adams County, Iowa from 1876 to 2024. Of those, 8 went Democratic and 26 went Republican. The county's typology — "Heartland Swing" — captures where that record, its demographics, and its recent swing place it among American communities.