O'Brien County, Iowa
AkashicO'Brien County, IATrumpR+60.7
2024 precinct map of O'Brien CountyPrecinct-level 2024 presidential results for O'Brien County, with each precinct boundary colored by Democratic-vs-Republican margin, and gold where an independent or third-party candidate carried the precinct.
How it voted
Share of the 2024 vote
| Donald Trump ✓Republican | 79.7% | 5,998 |
|---|---|---|
| Kamala HarrisDemocratic | 19.0% | 1,428 |
| Robert F Kennedy Jr.We The People | 0.6% | 48 |
Harris +50Trump +50
9 precincts · 7,525 votes. Hover any precinct for its result.
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1892–2024.
38 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| R | 19.0%Harris1,428 | 79.7%Trump5,998 | 0.6%Kennedy48 | 7,525 | ||
| R | 20.8%Biden1,569 | 77.6%Trump5,861 | 1.0%Jorgensen77 | 7,551 | ||
| R | 17.6%Clinton1,315 | 77.1%Trump5,752 | 2.6%Johnson197 | 7,460 | ||
| R | 26.8%Obama1,969 | 71.7%Romney5,266 | 0.4%Johnson33 | 7,341 | ||
| R | 31.9%Obama2,338 | 66.7%McCain4,894 | 1.4%Nader101 | 7,333 | ||
| R | 30.1%Kerry2,330 | 68.9%Bush5,328 | 0.9%Other73 | 7,731 | ||
| R | 30.8%Gore2,170 | 66.4%Bush4,674 | 1.5%Nader108 | 7,044 | ||
| R | 33.2%Clinton2,236 | 57.6%Dole3,877 | 8.6%Perot578 | 6,735 | ||
| R | 28.0%Clinton2,122 | 51.1%Bush3,869 | 20.5%Perot1,557 | 7,578 | ||
| R | 39.1%Dukakis2,768 | 60.0%Bush4,241 | 0.9%Larouche63 | 7,072 | ||
| R | 32.8%Mondale2,479 | 66.2%Reagan5,008 | 1.1%Larouche82 | 7,569 | ||
| R | 28.5%Carter2,210 | 63.6%Reagan4,937 | 7.9%Anderson614 | 7,761 | ||
| R | 36.4%Carter2,732 | 61.9%Ford4,643 | 1.7%McCarthy131 | 7,506 | ||
| R | 29.7%McGovern2,224 | 68.9%Nixon5,159 | 1.4%Schmitz108 | 7,491 | ||
| R | 26.6%Humphrey2,146 | 69.3%Nixon5,594 | 4.1%Wallace328 | 8,068 | ||
| R | 49.7%Johnson4,295 | 50.2%Goldwater4,336 | 0.1%Hass6 | 8,637 | ||
| R | 31.3%Kennedy2,967 | 68.7%Nixon6,509 | 0.0%Byrd4 | 9,480 | ||
| R | 32.6%Stevenson2,970 | 67.3%Eisenhower6,138 | 0.1%Andrews10 | 9,118 | ||
| R | 23.4%Stevenson2,192 | 76.2%Eisenhower7,130 | 0.4%Hallinan38 | 9,360 | ||
| R | 46.7%Truman3,421 | 50.5%Dewey3,697 | 2.8%Thurmond208 | 7,326 | ||
| R | 43.6%Roosevelt3,138 | 56.0%Dewey4,033 | 0.4%Thomas30 | 7,201 | ||
| R | 46.3%Roosevelt4,133 | 53.3%Willkie4,760 | 0.4%Thomas38 | 8,931 | ||
| D | 59.7%Roosevelt5,139 | 38.9%Landon3,350 | 1.4%Lemke123 | 8,612 | ||
| D | 57.4%Roosevelt4,503 | 40.9%Hoover3,213 | 1.7%Thomas132 | 7,848 | ||
| R | 32.8%Smith2,397 | 66.4%Hoover4,845 | 0.8%Thomas56 | 7,298 | ||
| R | 10.6%Davis756 | 58.5%Coolidge4,172 | 30.9%La Follette2,207 | 7,135 | ||
| R | 21.9%Cox1,468 | 76.5%Harding5,137 | 1.6%Debs109 | 6,714 | ||
| R | 46.5%Wilson1,787 | 52.5%Hughes2,021 | 1.0%Benson39 | 3,847 | ||
| O | 38.9%Wilson1,506 | 16.0%Taft620 | 45.1%Roosevelt1,744 | 3,870 | ||
| R | 40.0%Bryan1,326 | 57.7%Taft1,912 | 2.3%Debs76 | 3,314 | ||
| R | 26.8%Parker885 | 68.9%Roosevelt2,279 | 4.3%Debs142 | 3,306 | ||
| R | 37.5%Bryan1,461 | 61.2%McKinley2,386 | 1.4%Woolley54 | 3,901 | ||
| R | 38.8%Bryan1,562 | 60.1%McKinley2,421 | 1.1%Palmer45 | 4,028 | ||
| R | 43.6%Cleveland1,373 | 52.9%Harrison1,666 | 3.4%Weaver108 | 3,147 | ||
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presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −9.3% |
| 1896 | −21.3% |
| 1900 | −23.7% |
| 1904 | −42.2% |
| 1908 | −17.7% |
| 1912 | +22.9% |
| 1916 | −6.1% |
| 1920 | −54.6% |
| 1924 | −47.9% |
| 1928 | −33.5% |
| 1932 | +16.4% |
| 1936 | +20.8% |
| 1940 | −7.0% |
| 1944 | −12.4% |
| 1948 | −3.8% |
| 1952 | −52.8% |
| 1956 | −34.7% |
| 1960 | −37.4% |
| 1964 | −0.5% |
| 1968 | −42.7% |
| 1972 | −39.2% |
| 1976 | −25.5% |
| 1980 | −35.1% |
| 1984 | −33.4% |
| 1988 | −20.8% |
| 1992 | −23.1% |
| 1996 | −24.4% |
| 2000 | −35.5% |
| 2004 | −38.8% |
| 2008 | −34.9% |
| 2012 | −44.9% |
| 2016 | −59.5% |
| 2020 | −56.8% |
| 2024 | −60.7% |
DemocraticRepublican
voter registration
Registered voters
By party of registration, over time
DemocraticRepublicanUnaffiliatedOther parties
| Year | Total registered | Democratic | Republican | Unaffiliated | Other |
|---|---|---|---|---|---|
| 2008 | 10,608 | 1,740 | 5,240 | 3,628 | 0 |
| 2010 | 10,540 | 1,609 | 5,604 | 3,327 | 0 |
| 2012 | 10,425 | 1,555 | 5,581 | 3,285 | 4 |
| 2014 | 10,195 | 1,468 | 5,598 | 3,117 | 12 |
| 2016 | 10,059 | 1,320 | 6,004 | 2,703 | 32 |
| 2018 | 9,796 | 1,239 | 5,900 | 2,613 | 44 |
| 2020 | 9,927 | 1,404 | 6,118 | 2,340 | 65 |
| 2022 | 9,770 | 1,327 | 6,086 | 2,286 | 71 |
| 2024 | 9,732 | 1,212 | 6,143 | 2,294 | 83 |
Source: Iowa Secretary of State
O'Brien County's R+60.7 margin in 2024 places it among the most one-sided presidential counties in Iowa, reflecting the broader rural realignment that has reshaped the state's electoral map over the past decade.
Across the recorded series it reached a Democratic high of 22.9 points in 1912 and a Republican high of 60.7 points in 2024. Between 2020 and 2024 the county moved 3.9 points toward the Republican candidate; the 2024 margin was 60.7 points.
A population of 14,126, a 87% non-Hispanic-white share, and a median household income of $68,356 describe the county. The county's voting pattern over the last decade is most similar to that of Osceola County and Franklin County.
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
O'Brien County, Iowa. Akashic. https://akashic.app/county/19141/. Accessed May 20, 2026. License: CC BY 4.0.
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Frequently asked questions
How did O'Brien County, Iowa vote in 2024?
In 2024, O'Brien County, Iowa voted Republican by 60.7 points (R+60.7), carried by the Republican candidate. Out of 7,525 votes cast, 1,428 went Democratic and 5,998 went Republican.
When did O'Brien County, Iowa last vote Democratic?
The most recent presidential election in which O'Brien County, Iowa voted Democratic was 1936.
How many people live in O'Brien County, Iowa?
O'Brien County, Iowa has a population of 14,126 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in O'Brien County, Iowa?
Median household income in O'Brien County, Iowa is $68,356 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of O'Brien County, Iowa?
Akashic tracks 38 presidential elections in O'Brien County, Iowa from 1876 to 2024. Of those, 2 went Democratic and 31 went Republican.