in New Castle County, DE

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New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of the 2010 census, the population was 538,479, making it the most populous county in Delaware. The county seat is Wilmington.

This county is named after the city of New Castle in England.

New Castle County has the highest population and population density of any Delaware county. It is also the most economically developed of the three.


The numbers contained within parentheses above indicate the number of listings within that city.

Counties Near New Castle

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