Alternate Unofficial Names: Aresapa, Cannekonkan, Delaware Town, Fort Casimir, Fort Casimires, Fort Kasimier, Fort Trefalldigheet, Fort Trinity, Macherish Kitton, Neucastle, New Amstel, New Castel, New Castl, New Castle Town, Newcastle, Newcastle Town, Nieuwer-Amstel, Niew Amstel, Santhoeck, Tamakonck, Tamecongh, Trefaldighet, Trefalldigheet.
New Castle had a population of 5,033; a land area of 3.4 sq. miles; a water area of 0.12 sq. miles; and a population density of 1,480.73 people per sq. mile according to the US Census Bureaue estimate of July 1, 2009. Latest Census Estimates for all incorporated places in Delaware.