Divisions of the Australian House of Representatives

Section 24 of the Constitution of Australia specifies that the total number of members of the Australian House of Representatives shall be "as nearly as practicable" twice as many as the number of members of the Australian Senate. The section also requires that electorates be apportioned among the states in proportion to their respective populations; provided that each original state has at least 5 members in the House of Representatives, a provision that has given Tasmania higher representation than its population would otherwise justify. There are three electorates in the Australian Capital Territory and even though the Northern Territory should have only one electorate based on their population, parliament have legislated that they receive two.

In addition, Section 29 forbids electorate boundaries from crossing state lines, forcing populated areas along state and territory borders to be placed in different electorates, such as Albury in New South Wales being part of the electorate of Farrer, while nearby Wodonga in Victoria is part of the electorate of Indi. The same restriction does not apply to territories, and several current electoral divisions incorporate electors from multiple territories. This is currently the case for the Division of Bean (covering part of the ACT and the whole of Norfolk Island), the Division of Fenner (covering part of the ACT and the whole of Jervis Bay Territory), and the Division of Lingiari (covering part of the Northern Territory and the whole of Christmas Island and Cocos (Keeling) Islands).

The Commonwealth Electoral Act 1918 sets out further provisions.[1]

The Australian Electoral Commission (AEC) determines the number of members of the House of Representatives to which each state and territory is entitled (called apportionment) and the boundaries of each electorate, in a process known as redistribution. Such apportionment and redistributions apply to the next federal election, but not to any by-elections. The last apportionment determination was made in July 2020, and the resulting redistribution is to take place during 2021, in time for the next federal election, due by 2022.

Within each state and territory, electoral boundaries are redrawn from time to time. This takes place at least once every 7 years, or when the state's entitlement to the number of members of the House of Representatives changes. Boundaries are drawn by a Redistribution Committee, and redistributions within a state are on the basis of the number of enrolled voters, rather than total residents or "population". The number of enrolled voters in each division cannot vary by more than 10% from the average across a state or territory, nor can the number of voters vary by more than 3.5% from the average projected enrolment 3.5 years into the future. However, due to various reasons, larger seats like Cowper in New South Wales contain 80% more electors than that of smaller seats like Solomon in the Northern Territory. In 2018, seats in Victoria, Tasmania and South Australia were also abolished, in order to make way for seats in similar locations but with different names.[2][3]

At the 2019 Australian federal election, based on the 2018 apportionment, there were 151 divisions: 47 in New South Wales, 38 in Victoria, 30 in Queensland, 16 in Western Australia, 10 in South Australia, 5 in Tasmania, 3 in the ACT and 2 in Northern Territory.

The divisions of the House of Representatives are unusual in that many of them are not named after geographical features or numbered, as is the case in most other legislatures around the world. Most divisions are named in honour of prominent historical people, such as former politicians (often Prime Ministers), explorers, artists and engineers.

In some cases where a division is named after a geographical locality, the connection to that locality is sometimes tenuous. For instance, the Division of Werriwa, created in 1901, was named after the Aboriginal word for Lake George in the Canberra region. However, Werriwa has not contained Lake George for many decades, and has steadily moved some 200 km north to the south-western suburbs of Sydney over the past century.

The divisions that existed at the 2019 Australian federal election were:

These divisions no longer exist:

• List of members of the Australian House of Representatives
• Australian electoral system

• Adam Carr's Electoral Archive: Index of House of Representatives Divisions 1901–2001