New Castle County Address Data

  • State: Delaware
  • County: New Castle County
  • County Seat: Wilmington
  • FIPS: 10003
  • Founded in: 1673
  • Population: 559,335
  • Density: 1,312 Persons/Square Mile
  • Area: 426 Square Miles
  • Government Type: County
  • Authority: Dillon's Rule
  • Legislative Body: County Council
  • Legislative Body Size: 13
  • County Contact: 87 Reads Way
    County Government Center
    New Castle, DE 19720-1648
  • County site: http://nccde.org/
  • Labor Force: 298,915
  • Unemployment Rate: 3.70%
  • Gross Domestic Product (GDP): $42.5 B

Top Cities in New Castle County

Major Cities (population)

Neighbor Counties

  • Kent County
  • Cecil County
  • Kent County
  • Gloucester County
  • Salem County
  • Chester County
  • Delaware County
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