Mercer County, NJ

NJ · Presidential Elections 1892–2024

D+33.8
2024 Margin
R+6.6%
2020→2024 Swing
D since 1988
Voting Streak
386K
Population

Mercer County, NJ (New Jersey) voted D+33.8 for Kamala Harris (Democrat) in the 2024 presidential election, with Harris receiving 107,558 votes (65.67%) to 52,274 (31.92%) for Trump.

This represents a R+6.6% swing toward Republicans compared to 2020. Mercer County is classified as a deep Democratic county. Mercer County has voted Democratic in every presidential election since 1988. The county has a population of approximately 385,864.

Quick Stats

2024 ResultD+33.8
2020→2024 SwingR+6.6%
Voting StreakD since 1988
Elections on Record34

Demographics

Population385,864
Median Age
39.5(US: 38.7)
College (BA+)
45.4%(US: 35.2%)
Median Income
$100,645(US: $80k)
White (non-Hisp)
44.2%(US: 57.6%)
Hispanic
23.1%(US: 19.1%)
Black
19.4%(US: 12.2%)
Asian
12.2%(US: 5.7%)
Homeownership
62.1%(US: 64.5%)
Poverty Rate
10.3%(US: 12.3%)
Veterans
3.4%(US: 6.2%)
Non-English (CVAP)
23.3%(US: 17.0%)
Source: Census ACS 5-Year (2020-2024)

Community Profile

Religious Composition

Source: Religion Census 2020
Catholic
27.8%
Mainline Protestant
6.6%
Evangelical
5.5%(Below Average)
Black Protestant
2.3%
Jewish
1.1%(Major Center)
+ 1 more traditions

Ancestry Groups

Source: Census ACS

Top reported ancestry groups (compared to national average).

Italian
10.2%Above Average(2.1x)
Irish
9.8%
German
8.3%
English
5.7%
Puerto Rican
5.0%Significant Hub(3.0x)
Polish
4.9%Above Average(2.0x)
+ 5 more reported ancestry groups

Age Distribution

Median:39.5 yrs(US: 38.5)
Under 18
22.0%
18-29
10.2%↓
30-44
18.5%
45-64
33.4%↑
65+
15.9%
National average

Employment by Industry

Census ACS
Professional & Technical
14.5%(1.2x US)
Retail Trade
8.7%(0.8x US)
Manufacturing
7.8%(0.8x US)
Educational Services
7.3%(0.9x US)
Construction
5.4%(0.8x US)
Healthcare & Social Services
4.0%(0.9x US)
National average

Presidential Elections

Presidential Results

YearDemocratRepublicanMarginSwing
202465.7%(107,558)31.9%(52,274)D+33.8R+6.6
202069.8%(122,532)29.4%(51,641)D+40.4D+3.3
201666.3%(104,775)29.2%(46,193)D+37.1D+0.4
201267.2%(104,377)30.5%(47,355)D+36.7D+0.6
200867.4%(107,926)31.4%(50,223)D+36.1D+12.7
200461.3%(91,580)37.9%(56,604)D+23.4R+3.6
200061.4%(83,256)34.4%(46,670)D+27.0R+1.2
199658.9%(77,641)30.8%(40,559)D+28.2D+13.8
199249.1%(71,383)34.8%(50,473)D+14.4D+11.9
198850.8%(68,712)48.3%(65,384)D+2.5D+5.9

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

Presidential Margin Trend

Mercer County, NJ • 1892–2024

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

Senate Elections

Senate Results

YearDemocratRepublicanMarginSwing
202467.5%(105,685)30.0%(46,932)D+37.5R+0.5
202068.3%(117,821)30.3%(52,248)D+38.0D+6.8
201863.7%(80,773)32.5%(41,225)D+31.2R+2.3
201465.8%(52,476)32.3%(25,749)D+33.5R+1.1
201366.2%(38,934)31.6%(18,576)D+34.6R+2.8
201267.7%(97,964)30.3%(43,793)D+37.5D+11.0
200862.2%(91,088)35.7%(52,298)D+26.5D+3.9
200660.0%(56,111)37.4%(34,958)D+22.6D+4.9
200257.6%(53,675)39.9%(37,195)D+17.7D+3.2
200056.0%(72,250)41.5%(53,542)D+14.5R+1.0

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

Governor Elections

Governor Results

YearDemocratRepublicanMarginSwing
202571.2%(91,713)28.1%(36,156)D+43.2D+11.4
201764.9%(59,992)33.1%(30,645)D+31.7D+37.3
201346.3%(43,282)51.9%(48,530)R+5.6R+20.9
200954.5%(55,199)39.3%(39,769)D+15.2R+2.7
200557.1%(56,592)39.2%(38,871)D+17.9R+9.5
200160.9%(57,513)33.6%(31,705)D+27.3D+17.2
199750.9%(54,977)40.8%(44,056)D+10.1D+16.2
199345.9%(50,840)52.0%(57,599)R+6.1R+44.5
198968.5%(67,962)30.1%(29,887)D+38.4D+65.9
198535.6%(30,212)63.2%(53,562)R+27.5R+38.5

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

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