Presidential elections · 2000–2024
Mercer County, IL — Presidential Election Results (2000–2024)
In 2024, Mercer County, Illinois voted for Donald J. Trump (Republican) by R+27.1 — 2,950 Democratic to 5,215 Republican of 8,346 votes cast. From 2020 to 2024 it shifted 3.1 points toward Republicans. That makes it 38.0 points more Republican than Illinois overall (D+10.9).
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 | 2,950 | 5,215 | 181 | 35.3% | 62.5% | R+27.1 |
| 2020 | 3,280 | 5,418 | 195 | 36.9% | 60.9% | R+24.0 |
| 2016 | 3,071 | 4,807 | 647 | 36.0% | 56.4% | R+20.4 |
| 2012 | 4,507 | 3,876 | 151 | 52.8% | 45.4% | D+7.4 |
| 2008 | 4,887 | 3,833 | 128 | 55.2% | 43.3% | D+11.9 |
| 2004 | 4,512 | 4,405 | 57 | 50.3% | 49.1% | D+1.2 |
| 2000 | 4,400 | 3,688 | 230 | 52.9% | 44.3% | D+8.6 |
Mercer County presidential elections — FAQ
Who carried Mercer County in the 2024 presidential election?+
Donald J. Trump (Republican) carried Mercer County, Illinois in 2024 by R+27.1, with 8,346 votes cast. Data: MIT Election Data & Science Lab.
How did Mercer County shift between 2020 and 2024?+
Mercer County shifted 3.1 points toward Republicans between 2020 (R+24.0) and 2024 (R+27.1).
Is Mercer County more Democratic or Republican than Illinois overall?+
In 2024, Mercer County went R+27.1 while Illinois overall went D+10.9 — 38.0 points more Republican 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.