Wilmington is the county seat for New Castle County
Christiana is in New Castle County
New Castle County(818) ► ADJACENT TO NEW CASTLE COUNTY Kent County(262) ► Cecil County, Maryland(184) ► Kent County, Maryland(101) ► Gloucester County, New Jersey(55) ► Salem County, New Jersey(115) ► Chester County, Pennsylvania(459) ► Delaware County, Pennsylvania(283) ►
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