Newcastle, California, an unincorporated town in Placer County New Castle, Colorado, a Home Rule Municipality in Garfield County New Castle, Delaware, a city in New Castle County New Castle County, Delaware, the northernmost of the three counties New Castle Hundred, an unincorporated subdivision of New Castle County, Delaware New Castle, Indiana, a city in Henry County Webster City, Iowa, formerly Newcastle, county seat of Hamilton County New Castle, Kentucky, a city in Henry County Newcastle, Maine, a town in Lincoln County Newcastle, Nebraska, a village in Dixon County Newcastle Township, Dixon County, Nebraska, a township in Dixon County New Castle, New Hampshire, a town in Rockingham County New Cassel, New York, an unincorporated place in Nassau County New Castle, New York, a town in Westchester County New Castle, Ohio, an unincorporated community in Belmont County Newcastle, Ohio, an unincorporated community in Coshocton County Newcastle Township, Coshocton County, Ohio, one of the twenty-two townships of Coshocton County Newcastle, Oklahoma, the largest city in McClain County New Castle, Pennsylvania, a city in Lawrence County New Castle Northwest, Pennsylvania, a census-designated place in Lawrence County New Castle Township, Schuylkill County, Pennsylvania, a township in Schuylkill County South New Castle, Pennsylvania, a borough in Lawrence County Newcastle, Texas, a city in Young County Newcastle, Utah, an unincorporated community in southwestern Iron County New Castle, Virginia, the only town in Craig County Newcastle, Washington, a city in King County New Cassel, Wisconsin, a former village in Fond du Lac County Newcastle, Wyoming, a city located in Weston County