The ACT was granted self-government in 1989. The election for the First Assembly was held on 4 March 1989 and the first sitting took place on 11 May 1989. Prior to self-government, the ACT was administered by the federal parliament, with the first ACT Advisory Council established in 1930.

In October 2016, the number of Members of the Assembly increased to 25 and the number of electorates from three to five. Members are elected for a fixed four-year term.

The next election will be held in 2028.

The CPA Australian Capital Territory Branch has a partnership/twinning relationship with the Parliament of Kiribati.

The Parliament of New South Wales, a bicameral parliament, is Australia’s oldest legislative body. The Legislative Council (upper house) is comprised of 42 members elected under a proportional representation system of voting, with the whole state as one electorate. Each member’s term is eight years. The Legislative Assembly (lower house) has 93 members elected under an optional preferential system of voting and counting. Each member represents an electoral district, with each term a maximum of four years.

There are approximately 700 staff across three parliamentary departments, including around 50 staff working for members of the Legislative Council and 200 electorate officers for members of the Legislative Assembly.

The current 58th Parliament of New South Wales was elected at a general election held on 25 March 2023. The next election will be held in 2027.

The CPA New South Wales Branch has a partnership/twinning relationship with the parliaments of Bougainville (Papua New Guinea) and Solomon Islands.

The Northern Territory Legislative Assembly is a unicameral parliament consisting of 25 members elected for a fixed four-year term.

The first Legislative Council for the Northern Territory was formed in March 1948. It consisted of seven official members appointed by the Governor-General, six elected members and the Administrator as President of the Council.

In 1974 the Legislative Council was replaced by a fully elected Legislative Assembly with nineteen members. In 1978 the Territory achieved self-government and in 1982, the number of members in the Legislative Assembly was increased to 25.

The next election is scheduled to be held in 2028.

The CPA Northern Territory Branch has a partnership/twinning relationship with the Parliament of Niue.

The Queensland Parliament is a unicameral parliament and has been the only unicameral state legislature in Australia since the upper chamber, the Legislative Council, was abolished in 1922.

In 2016, legislation was passed to increase the number of seats in parliament from 89 to 93 seats, change from optional preferential voting to full-preferential voting and move from unfixed three-year terns to fixed four year terms.

The next election will be held in October 2028.

The CPA Queensland Branch has a partnership/twinning relationship with the parliaments of Papua New Guinea and Vanuatu.

The Parliament of South Australia is a bicameral parliament and follows a Westminster system of parliamentary government. It consists of the 47-seat House of Assembly (lower house) and the 22-seat Legislative Council (upper house). All of the lower house and half of the upper house is filled at each election.

The 22 members of the Legislative Council are elected for eight year terms to represent the whole state and the 47 members of the House of Assembly each represent electorates of approximately 22,500 constituents.

Representatives are elected with a preferential voting system for four year terms with a fixed election date. At each election one half of the members of the Legislative Council, having served an eight year term are elected. Government is formed by the party with the majority of members in the lower house but the ministry can be made up of members from either house.

The current 55th Parliament of South Australia was elected at a general election held on 19 March 2022. The next election will be held in 2026.

The CPA South Australia Branch has a partnership/twinning relationship with the Parliament of Tonga.

The Parliament of Tasmania is the second oldest parliament in Australia, having been founded with a Legislative Council in 1825. The House of Assembly was established in 1856 when bicameral parliament and responsible government were granted. Currently the Legislative Council has 15 MLCs (six year terms) and the House of Assembly has 35 MPs (four year terms). In 1998 the House of Assembly was reduced from 35 to 25. However, at the 2024 State election, the size of the House was restored to 35 members.

Currently, Tasmania is the only jurisdiction at the state and territory level with no fixed parliamentary term. However, as members of the House of Assembly are elected for four year terms, the next Tasmanian State election must be held no later than 2028.

The CPA Tasmania Branch was established in 1926. The branch has a partnership/twinning relationship with the Parliament of Samoa and warm relations with a number of other CPA branches world-wide. Tasmania is also a member of the CPA small branches group.

The Parliament of Victoria is a bicameral legislature (two Houses) with representatives elected to either the Legislative Council (the Upper House) or the Legislative Assembly (the Lower House). The Assembly has 88 Members and the Council has 40 Members

The 2022 Victorian State election was held on Saturday, 26 November 2022 to elect the 60th Parliament of Victoria. The next State election will be held in 2026.

The CPA Victoria Branch has a partnership/twinning relationship with the parliaments of Nauru, Tuvalu and Fiji.

Western Australia has had responsible self-government and a bicameral legislature since 1890. The Legislative Council consists of 36 members with six members elected from each of six regions in the state and the Legislative Assembly has 59 members elected from single member constituencies. Each parliament has a four year term.

The next WA State Election will be held on Saturday 8 March 2025.

The CPA Western Australia Branch was established in 1925. The Branch has a partnership/twinning relationship with the Parliament of the Cook Islands.