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New Castle County, Delaware
County in Delaware, United States / From Wikipedia, the free encyclopedia
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New Castle County is the northernmost of the three counties of the U.S. state of Delaware (New Castle, Kent, and Sussex). As of the 2020 census, the population was 570,719,[2] making it the most populous county in Delaware, with nearly 60% of the state's population of 989,948. The county seat is Wilmington,[3] which is also the state's most populous city.
New Castle County | |
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![]() Old New Castle Courthouse in New Castle (1936) | |
![]() Location within the U.S. state of Delaware | |
![]() Delaware's location within the U.S. | |
Coordinates: 39°35′N 75°38′W | |
Country | ![]() |
State | ![]() |
Founded | August 8, 1673 |
Named for | William Cavendish, 1st Duke of Newcastle |
Seat | Wilmington |
Largest city | Wilmington |
Area | |
• Total | 494 sq mi (1,280 km2) |
• Land | 426 sq mi (1,100 km2) |
• Water | 68 sq mi (180 km2) 13.8% |
Population (2020) | |
• Total | 570,719[1] |
• Density | 1,339.72/sq mi (517.27/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional district | At-large |
Website | www |
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 (c. 1593–1676).[citation needed]
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.