Kamala D. Harris won Jefferson County with 57.3% of the vote, ahead of Donald J. Trump. 354,094 votes were counted. The party margin was a Democratic lead of 16.5 points. Compared with the previous presidential election in Jefferson County that is loaded, the margin moved 3.6 points toward Republicans.
Jefferson County leans Democratic by 17.7 points compared with the nation (our partisan lean index, based on president 2024 75% + 2020 25%).
Jefferson County voted for the winner of the national popular vote in 5 of 7 presidential elections from 2000 to 2024. On average its margin sat 9.1 points away from the national margin.
In 2024, 354,094 votes were cast in the biggest race, which is 62.2% of the 569,545 citizens aged 18 and over in Jefferson County.
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