Presidential elections · 2000–2024
Ada County, ID — Presidential Election Results (2000–2024)
In 2024, Ada County, Idaho voted for Donald J. Trump (Republican) by R+10.3 — 116,116 Democratic to 143,759 Republican of 267,419 votes cast. From 2020 to 2024 it shifted 6.4 points toward Republicans. That makes it 26.2 points more Democratic than Idaho overall (R+36.5).
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 Ada County
| Year | Democratic | Republican | Other | Dem share | Rep share | Margin |
|---|---|---|---|---|---|---|
| 2024 | 116,116 | 143,759 | 7,544 | 43.4% | 53.8% | R+10.3 |
| 2020 | 120,539 | 130,699 | 8,151 | 46.5% | 50.4% | R+3.9 |
| 2016 | 75,677 | 93,752 | 26,240 | 38.7% | 47.9% | R+9.2 |
| 2012 | 77,137 | 97,554 | 5,855 | 42.7% | 54.0% | R+11.3 |
| 2008 | 82,236 | 93,328 | 3,838 | 45.8% | 52.0% | R+6.2 |
| 2004 | 58,523 | 94,641 | 1,838 | 37.8% | 61.1% | R+23.3 |
| 2000 | 40,650 | 75,050 | 7,785 | 32.9% | 60.8% | R+27.9 |
Ada County presidential elections — FAQ
Who carried Ada County in the 2024 presidential election?+
Donald J. Trump (Republican) carried Ada County, Idaho in 2024 by R+10.3, with 267,419 votes cast. Data: MIT Election Data & Science Lab.
How did Ada County shift between 2020 and 2024?+
Ada County shifted 6.4 points toward Republicans between 2020 (R+3.9) and 2024 (R+10.3).
Is Ada County more Democratic or Republican than Idaho overall?+
In 2024, Ada County went R+10.3 while Idaho overall went R+36.5 — 26.2 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.