Jefferson County, MO

MO · Presidential Elections 1892–2024

R+36.6
2024 Margin
R+3.2%
2020→2024 Swing
R since 2012
Voting Streak
229K
Population

Jefferson County, MO (Missouri) voted R+36.6 for Donald Trump (Republican) in the 2024 presidential election, with Trump receiving 80,796 votes (67.42%) to 36,965 (30.85%) for Harris.

This represents a R+3.2% 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 2012. The county has a population of approximately 229,458.

Quick Stats

2024 ResultR+36.6
2020→2024 SwingR+3.2%
Voting StreakR since 2012
Elections on Record34

Demographics

Population229,458
Median Age
40.3(US: 38.7)
College (BA+)
24.7%(US: 35.2%)
Median Income
$82,851(US: $80k)
White (non-Hisp)
89.0%(US: 57.6%)
Hispanic
2.6%(US: 19.1%)
Black
1.0%(US: 12.2%)
Homeownership
82.2%(US: 64.5%)
Poverty Rate
9.0%(US: 12.3%)
Veterans
7.3%(US: 6.2%)
Non-English (CVAP)
2.9%(US: 17.0%)
Source: Census ACS 5-Year (2020-2024)

Community Profile

Religious Composition

Source: Religion Census 2020
Evangelical
17.0%
Catholic
14.7%
Mainline Protestant
2.0%
LDS/Mormon
0.5%
Black Protestant
0.4%

Ancestry Groups

Source: Census ACS

Top reported ancestry groups (compared to national average).

German
29.2%Above Average(2.4x)
Irish
14.6%(1.6x)
English
11.3%(1.3x)
American Heritage
6.2%
Italian
5.3%
French
4.4%Above Average(2.3x)
+ 2 more reported ancestry groups

Age Distribution

Median:40.3 yrs(US: 38.5)
Under 18
22.5%
18-29
7.4%↓
30-44
19.6%
45-64
33.8%↑
65+
16.7%
National average

Employment by Industry

Census ACS
Manufacturing
12.3%(1.3x US)
Retail Trade
11.7%
ConstructionRegional Strength
10.9%(1.6x US)
Professional & Technical
10.3%(0.9x US)
Educational Services
7.5%(0.9x US)
Healthcare & Social Services
5.1%(1.1x US)
National average
+ 1 more sectors

Presidential Elections

Presidential Results

YearDemocratRepublicanMarginSwing
202430.9%(36,965)67.4%(80,796)R+36.6R+3.2
202032.3%(37,856)65.7%(77,046)R+33.4D+1.6
201629.5%(31,568)64.5%(69,036)R+35.0R+22.4
201242.4%(41,564)55.1%(53,978)R+12.7R+15.2
200850.6%(53,467)48.1%(50,804)D+2.5D+3.1
200449.4%(46,057)50.0%(46,624)R+0.6R+3.0
200050.0%(38,616)47.6%(36,766)D+2.4R+10.0
199648.5%(32,073)36.1%(23,877)D+12.4R+3.8
199244.3%(32,569)28.1%(20,637)D+16.2D+18.9
198848.5%(27,738)51.2%(29,279)R+2.7D+23.9

Source: Official state election returns via MIT Election Data + Science Lab

Presidential Margin Trend

Jefferson County, MO • 1892–2024

D+R++40+200-20-4018921900190819161924193219401948195619641972198019881996200420122020
Democratic margin
Republican margin

Senate Elections

Senate Results

YearDemocratRepublicanMarginSwing
202435.2%(41,469)62.1%(73,111)R+26.9R+0.8
202237.0%(28,653)63.0%(48,845)R+26.1R+13.6
201841.9%(37,915)54.3%(49,142)R+12.4R+6.5
201644.4%(46,975)50.3%(53,218)R+5.9R+19.4
201253.5%(51,862)40.0%(38,745)D+13.5D+28.5
201038.9%(25,689)53.8%(35,585)R+15.0R+24.5
200653.3%(39,271)43.8%(32,232)D+9.6D+12.5
200447.9%(44,469)50.8%(47,203)R+2.9R+8.5
200252.1%(32,497)46.5%(29,018)D+5.6R+2.6
200053.5%(41,321)45.3%(34,980)D+8.2R+1.1

Source: Official state election returns via MIT Election Data + Science Lab

Governor Elections

Governor Results

YearDemocratRepublicanMarginSwing
202430.5%(35,753)67.0%(78,385)R+36.4R+6.1
202033.6%(38,866)63.9%(73,942)R+30.3R+19.4
201642.7%(45,234)53.6%(56,755)R+10.9R+24.8
201255.7%(53,971)41.8%(40,470)D+13.9R+15.5
200863.9%(66,697)34.4%(35,947)D+29.4D+29.4
200449.2%(45,909)49.2%(45,891)D+0.0R+2.3
200049.3%(37,808)47.0%(36,060)D+2.3R+6.8
199653.0%(34,970)43.9%(28,986)D+9.1R+17.4
199263.2%(45,667)36.8%(26,542)D+26.5D+51.7
198836.8%(21,104)62.1%(35,559)R+25.2R+14.1

Source: Official state election returns via MIT Election Data + Science Lab

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