City of Newcastle, a local government area in New South Wales Division of Newcastle, a federal electoral division in New South Wales Electoral district of Newcastle, an electoral district of the New South Wales Legislative Assembly County of Newcastle, a cadastral unit in South Australia Electoral district of Newcastle (South Australia) 1884–1902, 1915–1956 in the South Australian House of Assembly Newcastle Waters, a town and locality in the Northern Territory Toodyay, Western Australia, known as Newcastle until 1910