Presidential elections · 2000–2024
Mercer County, NJ — Presidential Election Results (2000–2024)
In 2024, Mercer County, New Jersey voted for Kamala D. Harris (Democratic) by D+33.9 — 107,558 Democratic to 52,274 Republican of 163,270 votes cast. From 2020 to 2024 it shifted 6.2 points toward Republicans. That makes it 28.0 points more Democratic than New Jersey overall (D+5.9).
Data: MIT Election Data & Science Lab, Harvard Dataverse.
Margin by election, 2000–2024
Democratic minus Republican, in points of all votes cast — blue bars Democratic, red Republican.
Every election in Mercer County
| Year | Democratic | Republican | Other | Dem share | Rep share | Margin |
|---|---|---|---|---|---|---|
| 2024 | 107,558 | 52,274 | 3,438 | 65.9% | 32.0% | D+33.9 |
| 2020 | 122,532 | 51,641 | 2,431 | 69.4% | 29.2% | D+40.1 |
| 2016 | 104,775 | 46,193 | 5,561 | 66.9% | 29.5% | D+37.4 |
| 2012 | 104,377 | 47,355 | 1,779 | 68.0% | 30.8% | D+37.1 |
| 2008 | 107,926 | 50,223 | 400 | 68.1% | 31.7% | D+36.4 |
| 2004 | 91,580 | 56,604 | 1,326 | 61.3% | 37.9% | D+23.4 |
| 2000 | 83,256 | 46,670 | 5,633 | 61.4% | 34.4% | D+27.0 |
Mercer County presidential elections — FAQ
Who carried Mercer County in the 2024 presidential election?+
Kamala D. Harris (Democratic) carried Mercer County, New Jersey in 2024 by D+33.9, with 163,270 votes cast. Data: MIT Election Data & Science Lab.
How did Mercer County shift between 2020 and 2024?+
Mercer County shifted 6.2 points toward Republicans between 2020 (D+40.1) and 2024 (D+33.9).
Is Mercer County more Democratic or Republican than New Jersey overall?+
In 2024, Mercer County went D+33.9 while New Jersey overall went D+5.9 — 28.0 points more Democratic than the state.
Where does this election data come from?+
County-level presidential returns (2000–2024) come from the MIT Election Data and Science Lab (MEDSL), published on the Harvard Dataverse. pumsdata is an independent product that makes the data easy to map and compare, and is not affiliated with MEDSL or Harvard.