The party has four members in the federal and state parliaments: Sarah Hanson-Young and Barbara Pocock in the Senate; and Tammy Franks and Robert Simms in the South Australian Legislative Council.

Since that time, the Greens SA have steadily built up a support base at state and federal elections, partly due to the demise of the Democrats.

She won the sixth and final South Australian Senate position with a primary vote of 6.5 percent.

[3] Sparked by the resignation of Liberal Party MP Alexander Downer, a Mayo by-election was held in 2008.

Later that month, Robert Simms was appointed to the casual vacancy by a joint sitting of the Parliament of South Australia.

[8] When Prime Minister Turnbull announced in March 2016 that a double dissolution would be taking place in May and an election in July,[9] the party was forced for the first time to choose between their two senators, and preselected Sarah Hanson-Young to the number 1 preference on the Senate ballot, with Robert Simms at number 2.

[12] The party polled strongest in the seat of Adelaide, where Barbara Pocock received 15.7% of first preference votes.

[17] With Hanson-Young not requiring re-election in the middle of her six-year term, the party sought to double its upper-house representation.

[18] The party polled strongest in the Division of Adelaide, where Rebecca Galdies received 20.1% of first preference votes.

[19] To fill the seat vacated by Vickie Chapman, the party preselected Jim Bastiras as the candidate for the Bragg by-election.

The party also has a Policy and Campaigning Council, which includes representatives from branches and member action groups and meets every two months to shape the party's strategic priorities Branches are where new members first meet other Greens, talk politics and policy, get involved in local campaigning and fundraising, and find out about what else is going on.