States and territories

Australia has six states, two major mainland territories, and other minor territories. The states are New South Wales, Queensland, South Australia, Tasmania, Victoria, and Western Australia. The two major mainland territories are the Northern Territory and the Australian Capital Territory. In most respects, the territories function like the states, but the Commonwealth Parliament can override any legislation of their parliaments. By contrast, federal legislation only overrides state legislation in certain areas that are set out in Section 51 of the Constitution; State parliaments retain all residual legislative powers, including powers over hospitals, education, police, the judiciary, roads, public transport, and local government.
Each state and territory has its own legislature: unicameral in the Northern Territory, the ACT, and Queensland, and bicameral in the remaining states. The lower house is known as the Legislative Assembly (House of Assembly in South Australia and Tasmania) and the upper house is known as the Legislative Council. The head of the government in each state is the premier, and in each territory the chief minister. The Queen is represented in each state by a governor; an administrator in the Northern Territory, and the Australian Governor-General in the ACT, have analogous roles.
Australia also has several minor territories; the federal government administers a separate area within New South Wales, the Jervis Bay Territory, as a naval base and sea port for the national capital. In addition Australia has the following, inhabited, external territories: Norfolk Island, Christmas Island, Cocos (Keeling) Islands, and several largely uninhabited external territories: Ashmore and Cartier Islands, Coral Sea Islands, Heard Island and McDonald Islands, and the Australian Antarctic Territory.