  electoral divisions for the australian house of representatives are commonly known as electorates, seats or divisions. there are currently 150 single-member electorates for the australian house of representatives. ==apportionment== section 24 of the constitution of australia requires 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. section 24 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 gives tasmania higher representation than its population would justify. the commonwealth electoral act 1918 sets out further provisions.australian electoral commission.research report 4 - australian federal redistributions 1901-2003. accessed 5 may 2008. there are also two electorates in both the australian capital territory and the northern territory. within each state and territory, electoral boundaries are redrawn from time to time in a process known as redistribution. 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 apportionment within a state is on the basis of the number of enrolled voters rather than total residents. within a state or territory, the number of enrolled voters in each division can not vary by more than 10% from the average across the state, nor can the number of voters vary by more than 3.5% from the average projected enrolment three-and-a-half years into the future. divisions are divided into four classes according to population and demographic: inner metropolitan (well-established portions of a state capital city), outer metropolitan (more recently developed portions of a state capital), provincial (divisions made up predominantly of regional cities) and rural.demographic classification of divisions ==naming== 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 
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