New Castle is a city in New Castle County, Delaware, United States. The city is located six miles south of Wilmington and is situated on the De…New Castle is a city in New Castle County, Delaware, United States. The city is located six miles south of Wilmington and is situated on the Delaware River. As of 2020, the city's population was 5,551. New Castle constitutes part of the Delaware Valley or Philadelphia metropolitan area.
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