Adelaide is a single-member electoral district for the South Australian House of Assembly.

The 22.8 km² state seat of Adelaide currently consists of the Adelaide city centre including North Adelaide and suburbs to the inner north and inner north east: Collinswood, Fitzroy, Gilberton, Medindie, Medindie Gardens, Ovingham, Thorngate, Walkerville, most of Prospect, and part of Nailsworth.

It became a safe Labor seat at the landslide 2006 election on a 60.2 percent two-party vote, before the Liberals won Adelaide for the second time at the 2010 election on a two-party swing of over 14 percent, turning it from safe Labor to marginal Liberal.

The draft of the 2016 Redistribution Report had proposed moving the Liberal-voting suburbs of Walkerville and Gilberton to a neighbouring electorate, but Liberal incumbent Rachel Sanderson proceeded with a concerted campaign, organising the mass letter-box distribution of a pro forma document in the two suburbs, which aimed for residents to use the pro forma document to submit their objection to the commission.

[11] Sanderson was defeated at the 2022 South Australian state election by Labor’s Lucy Hood.