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Facts about New Castle County
| County | New Castle |
| State | Delaware |
| Country | USA |
| Population – 2015 | 556,779 |
List of Counties in Delaware |
|||||
|---|---|---|---|---|---|
| County Name | County Seat/Capital | State | 2010 pop. | Area-km | Area-mi |
| Kent | Dover | Delaware | 1,62,310 | 1,518 | 586 |
| New Castle | Wilmington | Delaware | 5,38,479 | 1,104 | 426 |
| Sussex | Georgetown | Delaware | 1,97,145 | 2,424 | 936 |