New Castle County, Delaware On November 6, 1674, New Amstel was made dependent on New York Colony, and was renamed New Castle on November 11, 1674. On September 22, 1676, New Castle County was formally placed under the Duke of York's laws. It gained land from Upland County on November 12, 1678. On June 21, 1680, St. Jones County was carved from New Castle County. It is known today as Kent County, Delaware. On August 24, 1682, New Castle County, along with the rest of the surrounding land, was transferred from the Colony of New York to the possession of William Penn, who established
New Castle County, Delaware county's legislative body is a thirteen-member county council, consisting of twelve members elected by district and one president elected at large. New Castle County Council doubled in size to thirteen from seven members in 2004. The current president is Karen Hartly-Nagle (D). The current county council members are: Further information can be found at: http://www.nccde.org/council As with Delaware's other two counties, New Castle County has no judiciary of its own. All judicial functions, except for Alderman's Courts, are managed and funded by the state of Delaware. In New Castle County, only the cities of Newport and Newark have Alderman's Courts.