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The term redistribution is used in Australia to mean a redrawing of electoral boundaries. It is equivalent to the term redistricting in the United States.

In the House of Representatives each State and Territory is divided into electoral divisions. The number of these divisions is determined by population. To ensure equal representation, the boundaries of these divisions have to be redrawn or redistributed periodically. A redistribution (or redrawing) of the geographic boundaries of these divisions takes place at least once every seven years to make sure that there is, as near as practicable, the same number of electors in each division within a State/Territory.

In deciding where the boundaries should be drawn, many factors are taken into consideration by the AEC.^[1]

A redistribution is necessary in three circumstances: when the number of parliamentary representatives to which a State or Territory is entitled has changed; the number of electors in more than one third of the divisions in a State or one of the divisions in the ACT or Northern Territory deviates from the average divisional enrolment by over 10% for a period of more than two months; or a period of 7 years has elapsed since the previous redistribution.

A redistribution is undertaken by a committee consisting of the Electoral Commissioner, the Australian Electoral Officer for the State concerned (in the ACT, the senior Divisional Returning Officer), the State Surveyor-General and the State Auditor-General. As soon as possible after the redistribution process commences, the Electoral Commissioner invites public suggestions on the redistribution which must be lodged within 30 days. A further period of 14 days is allowed for comments on the suggestions lodged. The Redistribution Committee then divides the State or Territory into divisions and publishes its proposed redistribution. A period of 28 days is allowed after publication of the proposed redistribution for written objections. A further period of 14 days is provided for comments on the objections lodged. These objections are considered by an augmented Electoral Commission consisting of the four members of the Redistribution Committee and the two part-time members of the Electoral Commission. At the time of the redistribution the number of electors in the divisions may vary up to 10% from the 'quota' or average divisional figure but at a point 3.5 years after the expected completion of the redistribution, the figures should not vary from the average projected quota by more or less than 3.5%. Thus the most rapidly growing divisions are generally started with enrolments below the quota while those that are losing population are started above the quota.

The Parliament has no power to reject or amend the final determination of the augmented Electoral Commission.

Boundaries for the Australian House of Representatives and for the six state and two territorial legislatures are drawn up by independent authorities - at the federal level by the Australian Electoral Commission (AEC) and in the states and territories by their equivalent bodies. Politicians have no influence over the process, although they, along with any other citizen or organization, can make submissions to the independent authorities suggesting changes.

Interference in the redistribution process by politicians, of the kind which is common in the United States, would be a criminal offense in Australia. In 1977, federal Cabinet minister Reg Withers was forced to resign for suggesting to another minister that the name of a federal electorate be changed to suit a political ally.

• For an electoral history of each Division since Federation in 1901, see Adam Carr's Electoral Archive: Index of House of Representatives Divisions 1901-2001

1. ^ http://www.aec.gov.au/Electorates/Past_Redistributions/Overview.htm