Jefferson County, IL
IL · Presidential Elections 1892–2024
Jefferson County, IL (Illinois) voted R+47.7 for Donald Trump (Republican) in the 2024 presidential election, with Trump receiving 12,189 votes (73.15%) to 4,240 (25.45%) for Harris.
This represents a R+2.6% swing toward Republicans compared to 2020. Jefferson County is classified as a deep Republican county. Jefferson County has voted Republican in every presidential election since 2000. The county has a population of approximately 36,550.
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 | 25.4%(4,240) | 73.2%(12,189) | R+47.7 | R+2.6 |
| 2020 | 26.4%(4,608) | 71.5%(12,476) | R+45.1 | R+2.4 |
| 2016 | 26.0%(4,425) | 68.8%(11,695) | R+42.8 | R+20.0 |
| 2012 | 37.3%(6,089) | 60.1%(9,811) | R+22.8 | R+12.1 |
| 2008 | 43.5%(7,462) | 54.3%(9,302) | R+10.7 | D+9.6 |
| 2004 | 39.6%(6,713) | 60.0%(10,160) | R+20.3 | R+9.4 |
| 2000 | 43.5%(6,685) | 54.4%(8,362) | R+10.9 | R+19.8 |
| 1996 | 48.5%(7,263) | 39.6%(5,937) | D+8.9 | R+9.2 |
| 1992 | 49.2%(8,665) | 31.2%(5,497) | D+18.0 | D+17.3 |
| 1988 | 50.1%(7,729) | 49.4%(7,624) | D+0.7 | D+15.1 |
Source: Official state election returns via MIT Election Data + Science Lab
Presidential Margin Trend
Jefferson County, IL • 1892–2024
Senate Elections
Senate Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 29.5%(3,840) | 70.5%(9,163) | R+40.9 | R+3.8 |
| 2020 | 30.0%(5,099) | 67.1%(11,399) | R+37.1 | R+25.7 |
| 2016 | 41.6%(6,903) | 53.0%(8,790) | R+11.4 | D+2.6 |
| 2014 | 40.7%(5,018) | 54.7%(6,738) | R+14.0 | D+17.0 |
| 2010 | 31.1%(3,799) | 62.1%(7,580) | R+31.0 | R+54.3 |
| 2008 | 58.7%(9,475) | 35.4%(5,717) | D+23.3 | D+9.0 |
| 2004 | 55.8%(9,111) | 41.5%(6,778) | D+14.3 | R+2.8 |
| 2002 | 57.8%(7,416) | 40.7%(5,227) | D+17.1 | D+38.4 |
| 1998 | 38.3%(4,629) | 59.6%(7,210) | R+21.3 | R+32.4 |
| 1996 | 54.0%(7,976) | 42.9%(6,339) | D+11.1 | D+7.2 |
Source: Official state election returns via MIT Election Data + Science Lab
Governor Elections
Governor Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 21.4%(2,821) | 76.4%(10,096) | R+55.1 | R+30.1 |
| 2018 | 32.0%(4,408) | 57.0%(7,848) | R+25.0 | D+15.2 |
| 2014 | 26.8%(3,310) | 67.0%(8,281) | R+40.2 | R+12.2 |
| 2010 | 32.5%(4,030) | 60.5%(7,500) | R+28.0 | R+32.0 |
| 2006 | 46.5%(5,781) | 42.5%(5,279) | D+4.0 | D+2.9 |
| 2002 | 49.5%(6,435) | 48.4%(6,289) | D+1.1 | R+37.6 |
| 1998 | 69.0%(8,531) | 30.4%(3,751) | D+38.7 | D+77.3 |
| 1994 | 29.8%(3,414) | 68.4%(7,840) | R+38.6 | R+58.4 |
| 1990 | 59.6%(7,370) | 39.8%(4,925) | D+19.8 | D+64.2 |
| 1986 | 7.0%(799) | 51.5%(5,846) | R+44.5 | R+46.6 |
Source: Official state election returns via MIT Election Data + Science Lab