Jefferson County, IA
IA · Presidential Elections 1892–2024
Jefferson County, IA (Iowa) voted R+6.8 for Donald Trump (Republican) in the 2024 presidential election, with Trump receiving 4,353 votes (52.16%) to 3,788 (45.39%) for Harris.
This represents a R+5.4% swing toward Republicans compared to 2020. Jefferson County is classified as a lean Republican county. Jefferson County has voted Republican in every presidential election since 2016. The county has a population of approximately 15,705.
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 | 45.4%(3,788) | 52.2%(4,353) | R+6.8 | R+5.4 |
| 2020 | 48.2%(4,319) | 49.6%(4,443) | R+1.4 | R+0.9 |
| 2016 | 44.8%(3,710) | 45.2%(3,748) | R+0.5 | R+16.4 |
| 2012 | 56.3%(4,798) | 40.3%(3,436) | D+16.0 | R+4.3 |
| 2008 | 58.7%(5,070) | 38.5%(3,324) | D+20.2 | D+10.1 |
| 2004 | 54.2%(4,490) | 44.0%(3,648) | D+10.2 | D+15.3 |
| 2000 | 37.9%(2,863) | 43.0%(3,248) | R+5.1 | R+5.9 |
| 1996 | 35.1%(2,597) | 34.4%(2,541) | D+0.8 | D+0.5 |
| 1992 | 30.7%(2,562) | 30.5%(2,541) | D+0.3 | D+0.5 |
| 1988 | 49.3%(3,594) | 49.5%(3,614) | R+0.3 | D+22.6 |
Source: Official state election returns via MIT Election Data + Science Lab
Presidential Margin Trend
Jefferson County, IA • 1892–2024
Senate Elections
Senate Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 47.9%(3,214) | 48.6%(3,263) | R+0.7 | R+6.9 |
| 2020 | 51.7%(4,547) | 45.6%(4,008) | D+6.1 | D+14.3 |
| 2016 | 43.4%(3,447) | 51.6%(4,094) | R+8.2 | R+15.7 |
| 2014 | 51.4%(3,237) | 43.8%(2,761) | D+7.6 | D+14.2 |
| 2010 | 44.9%(2,987) | 51.5%(3,429) | R+6.6 | R+42.2 |
| 2008 | 67.7%(5,690) | 32.1%(2,700) | D+35.6 | D+65.1 |
| 2004 | 32.1%(2,598) | 61.6%(4,979) | R+29.5 | R+41.4 |
| 2002 | 52.8%(3,119) | 40.9%(2,414) | D+11.9 | D+49.7 |
| 1998 | 21.2%(1,354) | 59.0%(3,763) | R+37.8 | R+38.3 |
| 1996 | 39.3%(2,880) | 38.8%(2,841) | D+0.5 | D+35.5 |
Source: Official state election returns via MIT Election Data + Science Lab
Governor Elections
Governor Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 46.3%(3,086) | 51.8%(3,449) | R+5.5 | R+14.0 |
| 2018 | 53.0%(3,750) | 44.5%(3,146) | D+8.5 | D+13.5 |
| 2014 | 45.2%(2,856) | 50.1%(3,169) | R+5.0 | R+11.8 |
| 2010 | 50.7%(3,412) | 43.8%(2,949) | D+6.9 | R+10.7 |
| 2006 | 56.4%(3,418) | 38.7%(2,350) | D+17.6 | D+21.7 |
| 2002 | 38.9%(2,324) | 43.0%(2,571) | R+4.1 | R+12.4 |
| 1998 | 49.4%(3,160) | 41.1%(2,633) | D+8.2 | D+37.7 |
| 1994 | 25.1%(1,422) | 54.5%(3,096) | R+29.5 | D+2.0 |
| 1990 | 33.8%(1,928) | 65.3%(3,728) | R+31.5 | R+12.3 |
| 1986 | 40.4%(1,726) | 59.6%(2,547) | R+19.2 | R+1.1 |
Source: Official state election returns via MIT Election Data + Science Lab