New Castle County, Delaware New Castle County Police and Emergency Medical Services Division Headquarters and the emergency communications center supporting 911 services. The present building opened in 2007 with a construction cost of . The Headquarters occupied a former elementary school building on the same site prior to erection of the current building. New Castle is a Democratic-leaning county. Because its population is almost double the combined population of Kent and Sussex, the winner in New Castle County has also won Delaware overall in each of the last seventeen presidential elections. In 1992, 2000, 2004 and 2016, the Republican candidate carried Kent and Sussex,
New Castle County, Delaware parallel. According to the U.S. Census Bureau, the county has a total area of , of which is land and (13.8%) is water. The boundaries of New Castle County are described in § 102 of the Delaware Code. The county is drained by Brandywine Creek, Christina River, and other channels. Its eastern edge sits along the Delaware River and Delaware Bay. Two small exclaves of the county and the state lie across the Delaware River, on its east bank on the New Jersey side, Finns Point adjacent to Pennsville Township, New Jersey, and the northern tip of Artificial Island, adjacent