Former South Australian premier Steven Marshall has clung on to his seat following Saturday's state poll, despite another Liberal stronghold falling to Labor.
The ABC is projecting Labor candidate Catherine Hutchesson has beaten Liberal candidate Alex Hyde for the seat of Waite, which was previously held by Liberal-turned-independent Sam Duluk.
For the past 29 years, since the seat's formation in 1993, Waite has been regarded as a blue-ribbon seat and had never been in Labor hands.
In seven previous state elections, Waite was secured by a Liberal candidate, although Mr Duluk and former Liberal leader Martin Hamilton-Smith both became independents during their time in office.
Ms Hutchesson's victory takes Labor to 27 seats in the 47-seat House of Assembly, one less than the 28 at the so-called "Rannslide" of 2006, when Labor premier Mike Rann was emphatically returned to office.
But the ABC is projecting former premier Steven Marshall has clung on to the seat of Dunstan, seeing off a challenge from Labor candidate Cressida O'Hanlon.
With more than 80 per cent of ballots counted, Mr Marshall is more than 400 votes ahead on the seat's two-party preferred vote.
The Liberals suffered a thumping in Saturday's state election.
Losses include the seats of Gibson and Davenport, the latter of which had been a Liberal seat since its creation in 1970.
The party has so far only secured 15 seats, but that could increase as pre-poll ballot counting continues.
Independent candidate Lou Nicholson's lead over former Liberal minister David Basham in Finniss appears to have evaporated.
Mr Basham now has a slender lead, despite a swing against him of more than 14 per cent on the seat's two-party preferred vote, but the outcome remains too close to call.
Earlier on Thursday, Labor's cabinet was officially sworn in at Government House.
