O'Brien County, IA
IA · Presidential Elections 1892–2024
O'Brien County, IA (Iowa) voted R+60.7 for Donald Trump (Republican) in the 2024 presidential election, with Trump receiving 5,998 votes (79.71%) to 1,428 (18.98%) for Harris.
This represents a R+3.9% swing toward Republicans compared to 2020. O'Brien County is classified as a deep Republican county. O'Brien County has voted Republican in every presidential election since 1940. The county has a population of approximately 14,126.
Open in Cartographer
Interactive map with county profile in split-screen view
Quick Stats
Demographics
Community Profile
Religious Composition
Source: Religion Census 2020Ancestry Groups
Source: Census ACSTop reported ancestry groups (compared to national average).
Age Distribution
Employment by Industry
Census ACSPresidential Elections
Presidential Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2024 | 19.0%(1,428) | 79.7%(5,998) | R+60.7 | R+3.9 |
| 2020 | 20.8%(1,569) | 77.6%(5,861) | R+56.8 | D+2.6 |
| 2016 | 17.6%(1,315) | 77.1%(5,752) | R+59.5 | R+14.6 |
| 2012 | 26.8%(1,969) | 71.7%(5,266) | R+44.9 | R+10.1 |
| 2008 | 31.9%(2,338) | 66.7%(4,894) | R+34.9 | D+3.9 |
| 2004 | 30.1%(2,330) | 68.9%(5,328) | R+38.8 | R+3.2 |
| 2000 | 30.8%(2,170) | 66.3%(4,674) | R+35.5 | R+11.2 |
| 1996 | 33.2%(2,236) | 57.6%(3,877) | R+24.4 | R+1.3 |
| 1992 | 28.0%(2,122) | 51.1%(3,869) | R+23.1 | R+2.2 |
| 1988 | 39.1%(2,768) | 60.0%(4,241) | R+20.8 | D+12.6 |
Source: Official state election returns via MIT Election Data + Science Lab
Presidential Margin Trend
O'Brien County, IA • 1892–2024
Senate Elections
Senate Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 17.9%(972) | 80.3%(4,361) | R+62.4 | R+8.3 |
| 2020 | 22.0%(1,640) | 76.1%(5,675) | R+54.1 | D+14.6 |
| 2016 | 14.5%(1,060) | 83.2%(6,076) | R+68.7 | R+12.3 |
| 2014 | 20.1%(1,093) | 76.5%(4,151) | R+56.3 | D+11.6 |
| 2010 | 15.2%(831) | 83.1%(4,556) | R+68.0 | R+59.3 |
| 2008 | 45.6%(3,259) | 54.3%(3,881) | R+8.7 | D+60.6 |
| 2004 | 14.7%(1,110) | 84.0%(6,363) | R+69.3 | R+44.3 |
| 2002 | 36.7%(1,936) | 61.8%(3,258) | R+25.1 | D+40.2 |
| 1998 | 17.1%(828) | 82.4%(3,998) | R+65.3 | R+28.4 |
| 1996 | 31.0%(2,070) | 67.9%(4,541) | R+37.0 | D+32.8 |
Source: Official state election returns via MIT Election Data + Science Lab
Governor Elections
Governor Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 14.4%(776) | 84.2%(4,541) | R+69.8 | R+15.5 |
| 2018 | 22.1%(1,296) | 76.4%(4,472) | R+54.3 | D+15.0 |
| 2014 | 14.6%(794) | 83.8%(4,562) | R+69.3 | R+16.0 |
| 2010 | 22.1%(1,214) | 75.3%(4,143) | R+53.2 | R+12.9 |
| 2006 | 29.3%(1,513) | 69.7%(3,595) | R+40.3 | R+11.0 |
| 2002 | 34.4%(1,814) | 63.7%(3,359) | R+29.3 | D+4.6 |
| 1998 | 32.5%(1,589) | 66.5%(3,245) | R+33.9 | D+7.8 |
| 1994 | 28.4%(1,514) | 70.1%(3,733) | R+41.7 | D+6.6 |
| 1990 | 25.7%(1,421) | 73.9%(4,090) | R+48.2 | R+25.4 |
| 1986 | 38.6%(2,232) | 61.4%(3,555) | R+22.9 | D+10.9 |
Source: Official state election returns via MIT Election Data + Science Lab