New Jersey·NJ·FIPS 34021

Mercer County

Voted Democratic in 2024 · 163,270 votes cast

About Mercer County

Mercer County is a county located in the U.S. state of New Jersey. Its county seat is Trenton, also the state capital, prompting its nickname The Capital County. Mercer County alone constitutes the Trenton–Princeton metropolitan statistical area and is considered part of the New York combined statistical area by the U.S. Census Bureau, but also directly borders the Philadelphia metropolitan area and is included within the Federal Communications Commission's Philadelphia Designated Media Market Area. The county is part of the Central Jersey region of the state.

2024 Presidential Results

All candidates · Mercer County, New Jersey

Kamala D Harris(Democrat)

65.9%107,558

Won by 55,284 votes

Donald J Trump(Republican)

32.0%52,274

Other(Other)

1.9%3,048

Chase Oliver(Libertarian)

0.2%390

Margin History

Red = Republican, Blue = Democratic

2024D+33.9

2020D+40.1

2016D+37.4

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Swung Right in 2024

Mercer County shifted 6.3 points toward Republicans compared to 2020. Voter turnout decreased by 7.6%.

Mercer County — Local Discussion

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What does Mercer County really think?

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Election data: MIT Election Data Science Lab, Harvard Dataverse (CC BY 4.0)