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 only to lose New Castle by double digits–enough of a margin to swing the entire state to the Democrats. The Delaware Department of Services for Children, Youth, and Their Families (DSCYF) has its headquarters in the Delaware Youth and Family Center (DYFC), located in unincorporated New Castle County, near Wilmington. Several DSCYF juvenile facilities, including the New Castle County Detention Center (NCCDC), the Ferris School for Boys, and the Grace and Snowden Cottages are in unincorporated New Castle County. Several Delaware Department of Correction facilities are located in the county. The James T. Vaughn Correctional Center (JTVCC), formerly the Delaware