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New Castle Coonty is the northmaist o the three coonties o the U.S. state o Delaware. As o the 2010 census, the population wis 538,479,[1] makkin it the maist populous coonty in Delaware. The coonty seat is Wilmington.[2]

New Castle County, Delaware
Habs new castle county court house.jpg
Old New Castle Courthouse, Delaware Street, New Castle (1936)
Cairt o Delaware heichlichtin New Castle County
Location in the U.S. state o Delaware
Cairt o the Unitit States heichlichtin Delaware
Delaware's location in the U.S.
Foondit August 8, 1637
Seat Wilmington
Lairgest ceety Wilmington
 • Tot 494 sq mi (1,279 km2)
 • Laund 426 sq mi (1,103 km2)
 • Watter 68 sq mi (176 km2), 13.8%
Population (est.)
 • (2014) 552,778
 • Density 1,264/sq mi (488/km²)
Congressional destrict At-large
Time zone Eastern

New Castle Coonty is includit in the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Aurie. This coonty is namit efter the Inglis ceety o Newcastle.


  1. "State & County QuickFacts". United States Census Bureau. Retrieved June 12, 2014. 
  2. "Find a County". National Association of Counties. Retrieved June 7, 2011. 

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