Presidential elections · 2000–2024
McHenry County, IL — Presidential Election Results (2000–2024)
In 2024, McHenry County, Illinois voted for Donald J. Trump (Republican) by R+5.3 — 75,370 Democratic to 83,933 Republican of 162,283 votes cast. From 2020 to 2024 it shifted 2.8 points toward Republicans. That makes it 16.2 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 McHenry County
| Year | Democratic | Republican | Other | Dem share | Rep share | Margin |
|---|---|---|---|---|---|---|
| 2024 | 75,370 | 83,933 | 2,980 | 46.4% | 51.7% | R+5.3 |
| 2020 | 78,154 | 82,260 | 3,465 | 47.7% | 50.2% | R+2.5 |
| 2016 | 60,803 | 71,612 | 9,335 | 42.9% | 50.5% | R+7.6 |
| 2012 | 59,797 | 71,598 | 2,449 | 44.7% | 53.5% | R+8.8 |
| 2008 | 72,288 | 64,845 | 2,135 | 51.9% | 46.6% | D+5.3 |
| 2004 | 50,330 | 76,412 | 1,206 | 39.3% | 59.7% | R+20.4 |
| 2000 | 40,698 | 62,112 | 3,375 | 38.3% | 58.5% | R+20.2 |
McHenry County presidential elections — FAQ
Who carried McHenry County in the 2024 presidential election?+
Donald J. Trump (Republican) carried McHenry County, Illinois in 2024 by R+5.3, with 162,283 votes cast. Data: MIT Election Data & Science Lab.
How did McHenry County shift between 2020 and 2024?+
McHenry County shifted 2.8 points toward Republicans between 2020 (R+2.5) and 2024 (R+5.3).
Is McHenry County more Democratic or Republican than Illinois overall?+
In 2024, McHenry County went R+5.3 while Illinois overall went D+10.9 — 16.2 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.