Donald J. Trump won Ada County with 53.8% of the vote, ahead of Kamala D. Harris. 267,419 votes were counted. The party margin was a Republican lead of 10.3 points. Compared with the previous presidential election in Ada County that is loaded, the margin moved 6.4 points toward Republicans.
Ada County leans Republican by 9.0 points compared with the nation (our partisan lean index, based on president 2024 75% + 2020 25%).
Ada County voted for the winner of the national popular vote in 2 of 7 presidential elections from 2000 to 2024. On average its margin sat 15.9 points away from the national margin.
In 2024, 267,419 votes were cast in the biggest race, which is 70.0% of the 381,870 citizens aged 18 and over in Ada County.
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