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The Electoral Commissioner will soon determine how many federal electoral divisions (seats) each state and territory is entitled to. This determination occurs every electoral cycle, one year after the first sitting day for a new House of Representatives (current Parliament: 30 August 2016).
The determination is part of a broader process to ensure, as near as possible, that each electoral division has a similar number of enrolled voters. It will be calculated using estimated resident population data that is due to be released by the Australian Bureau of Statistics on 27 June 2017. It is possible for a state or territory to lose or gain a seat as a result of the determination and this would trigger a redistribution process to redraw the relevant jurisdiction’s seats to accommodate the change.
Further information – Does Australia always have 150 federal electoral divisions?