Northern Delaware GuideNorthern Delaware consists mainly of New Castle County, bordering on the Philadelphia and across Delaware Bay from New Jersey HotelsFind hotels in Newark, New Castle, Wilmington, Kennett Square and more. NewarkNewark is in Delaware. While European settlement of the area began in the 17th century, the city was not established by royal charter until 1758. New CastleNew Castle is a quiet town in Delaware, one of the United States of America. Soft breezes blow from the river over the cobblestone streets and through the quiet town. ClaymontClaymont is a town located in northern Delaware. A largely blue-collar suburb of Wilmington, its borders are not clearly defined; it is generally accepted to contain about 9,000 residents. WilmingtonWilmington is a city in Delaware. Other Major Airports in Driving Distance: Baltimore/Washington BWI John F. HockessinHockessin, is a small, rapidly growing town in northern New Castle County, right on the border with Pennsylvania.