St. Clair County, IL

IL · Presidential Elections 1892–2024

D+7.8
2024 Margin
R+0.8%
2020→2024 Swing
D since 1976
Voting Streak
254K
Population

St. Clair County, IL (Illinois) voted D+7.8 for Kamala Harris (Democrat) in the 2024 presidential election, with Harris receiving 63,433 votes (52.88%) to 54,021 (45.03%) for Trump.

This represents a R+0.8% swing toward Republicans compared to 2020. St. Clair County is classified as a lean Democratic county. St. Clair County has voted Democratic in every presidential election since 1976. The county has a population of approximately 253,694.

Quick Stats

2024 ResultD+7.8
2020→2024 SwingR+0.8%
Voting StreakD since 1976
Elections on Record34

Demographics

Population253,694
Median Age
39.9(US: 38.7)
College (BA+)
31.8%(US: 35.2%)
Median Income
$73,854(US: $80k)
White (non-Hisp)
59.5%(US: 57.6%)
Hispanic
5.1%(US: 19.1%)
Black
29.8%(US: 12.2%)
Asian
1.6%(US: 5.7%)
Homeownership
68.4%(US: 64.5%)
Poverty Rate
13.6%(US: 12.3%)
Veterans
11.5%(US: 6.2%)
Non-English (CVAP)
3.9%(US: 17.0%)
Source: Census ACS 5-Year (2020-2024)

Community Profile

Religious Composition

Source: Religion Census 2020
Evangelical
18.5%
Catholic
13.4%(Below Average)
Mainline Protestant
5.6%
Black Protestant
5.4%(Major Center)
LDS/Mormon
1.0%

Ancestry Groups

Source: Census ACS

Top reported ancestry groups (compared to national average).

German
21.5%Above Average(1.7x)
Irish
9.7%
English
8.7%
American Heritage
4.2%
Mexican
3.2%
Italian
2.8%
+ 2 more reported ancestry groups

Age Distribution

Median:39.9 yrs(US: 38.5)
Under 18
23.0%
18-29
8.1%↓
30-44
19.0%
45-64
32.5%↑
65+
17.4%
National average

Employment by Industry

Census ACS
Professional & Technical
12.4%
Retail Trade
10.2%
Educational Services
9.9%(1.1x US)
Manufacturing
8.8%
Construction
4.8%(0.7x US)
Healthcare & Social Services
4.3%
National average
+ 1 more sectors

Presidential Elections

Presidential Results

YearDemocratRepublicanMarginSwing
202452.9%(63,433)45.0%(54,021)D+7.8R+0.8
202052.8%(68,325)44.2%(57,150)D+8.6D+3.0
201650.0%(60,756)44.4%(53,857)D+5.7R+8.6
201256.1%(67,285)41.8%(50,125)D+14.3R+8.1
200860.6%(76,160)38.1%(47,958)D+22.4D+11.6
200455.1%(62,410)44.4%(50,203)D+10.8R+2.8
200055.7%(55,961)42.1%(42,299)D+13.6R+7.9
199656.6%(53,405)35.0%(33,066)D+21.5R+2.3
199253.6%(57,625)29.7%(31,951)D+23.9D+9.5
198857.0%(55,465)42.6%(41,439)D+14.4D+13.2

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

Presidential Margin Trend

St. Clair County, IL • 1892–2024

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

Senate Elections

Senate Results

YearDemocratRepublicanMarginSwing
202254.9%(47,856)45.1%(39,335)D+9.8D+1.2
202052.6%(66,801)44.0%(55,898)D+8.6R+10.3
201657.2%(68,709)38.3%(45,998)D+18.9D+13.8
201450.7%(38,813)45.5%(34,877)D+5.1D+4.7
201047.9%(38,512)47.5%(38,185)D+0.4R+33.2
200864.5%(77,920)30.9%(37,319)D+33.6R+3.5
200467.1%(74,447)30.0%(33,288)D+37.1D+14.2
200260.7%(39,848)37.7%(24,772)D+23.0D+33.2
199843.6%(29,939)53.8%(36,957)R+10.2R+32.0
199659.4%(55,878)37.6%(35,370)D+21.8D+0.4

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

Governor Elections

Governor Results

YearDemocratRepublicanMarginSwing
202250.3%(45,071)46.0%(41,154)D+4.4R+7.9
201853.4%(52,603)41.2%(40,524)D+12.3D+20.1
201443.9%(33,474)51.7%(39,438)R+7.8R+9.5
201048.4%(39,152)46.7%(37,772)D+1.7R+14.4
200655.6%(38,441)39.5%(27,318)D+16.1R+0.2
200257.3%(38,164)41.0%(27,324)D+16.3D+6.1
199854.6%(37,497)44.4%(30,486)D+10.2D+33.8
199437.3%(23,644)60.8%(38,601)R+23.6R+38.2
199056.8%(36,453)42.2%(27,079)D+14.6D+48.2
198615.0%(8,946)48.6%(28,938)R+33.6R+44.3

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

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