Delaware·DE·FIPS 10003

New Castle County

Voted Democratic in 2024 · 275,917 votes cast

About New Castle County

New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of the 2020 census, the population was 570,719, making it the most populous county in Delaware, with nearly 60% of the state's population of 989,948. The county seat is Wilmington, which is also the state's most populous city. New Castle County is included in the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area. The county is named after William Cavendish, 1st Duke of Newcastle. New Castle County has the highest population and population density of any Delaware county, and it is the smallest county in the state by area. It has more people than the other two counties, Kent and Sussex, combined. It is also the most economically developed of the three.

2024 Presidential Results

All candidates · New Castle County, Delaware

Kamala D Harris(Democrat)

65.5%180,700

Won by 89,832 votes

Donald J Trump(Republican)

32.9%90,868

Other(Other)

1.1%3,079

Chase Oliver(Libertarian)

0.5%1,270

Margin History

Red = Republican, Blue = Democratic

2024D+32.6

2020D+37.1

2016D+29.5

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Swung Right in 2024

New Castle County shifted 4.5 points toward Republicans compared to 2020. Voter turnout decreased by 4.1%.

New Castle County — Local Discussion

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What does New Castle County really think?

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