Polls have closed and counting is under way after almost three million Queenslanders voted to decide who will lead the next state government.
Premier Annastacia Palaszczuk and Liberal National Party leader Tim Nicholls are in for a tough fight, with Labor claiming a narrow lead over the LNP in the latest pre-election polling.
While the counting of booths and pre-polls has now begun, the hundreds of thousands of postal and absentee vote calculations do not begin until Sunday.
It took more than a week before Labor could claim power in 2015, after the LNP was resoundingly dumped after a single term.
This time, the resurgence of One Nation and return of compulsory preferential voting will further complicate Labor and the LNP's chances of winning a majority government.
Ms Palaszczuk started election day on the Gold Coast before returning to her south-west Brisbane electorate to cast her vote at Inala State School.
Mr Nicholls helped his 78-year-old father Peter at a polling booth in his blue-ribbon Clayfield seat.
Opposition leader heckled by Adani protesters
Mr Nicholls was swamped by anti-Adani protesters as he arrived at an inner Brisbane church to cast his ballot.
Mr Nicholls and wife Mary were heckled by chanting 'Stop Adani' protesters as they stopped outside the St John's Anglican Church in Hendra, where the LNP leader took a final dig at Ms Palaszczuk.
"I'm feeling really positive, we've got a great message, we're talking about cheaper power, we're talking about jobs, and jobs for regional Queensland that Annastacia Palaszczuk doesn't want to deliver," he told reporters.
Mr Nicholls has done his best to distance the LNP from One Nation but has not ruled out accepting their support to form a minority government.
Queensland One Nation leader Steve Dickson cast his vote in his Sunshine Coast seat of Buderim, which he is under pressure to hold.
Mr Dickson voted at Buderim Mountain State School on Saturday morning after admitting he was not confident of holding the seat.
One Nation leader Pauline Hanson is campaigning at a different polling booth on the Sunshine Coast.
Premier favoured to retain power
Ms Palaszczuk has played the underdog card but the premier is favoured to retain power.
Ms Palaszczuk returned home after an election campaign spent crisscrossing the state, casting her ballot at Inala State School.
The premier repeated her mantra that voters have a "clear choice" box between her government or the Liberal Nation Party with One Nation support.
"That (choice) is whether they want to continue with a stable, hardworking, decent government, or do they want to put that at risk with Tim Nicholls as Premier with Pauline Hanson," the premier told reporters.
The Inala MP also urged LNP voters uncomfortable with One Nation to vote for her just one time, to avoid "cuts and chaos".
Ms Palaszczuk was not short of support as she cast her ballot.
Her father Henry, mother Lorelle and youngest sister Julia all handed out how to vote cards.
The premier said it was good to be back in Inala at the end of a long month of campaigning.
"It's always lovely to be here," Ms Palaszczuk said.
"The people of Inala in this electorate here drive me every single day, as do the people of the state, so I just want the best for families."
Polling puts Labor marginally ahead of the Liberal National Party on a two-party-preferred basis, but the reintroduction of compulsory preferential voting has clouded the results.
The rise of One Nation, major boundary redistributions and numerous three-cornered contests has the major parties on tenterhooks as they expect the race to go down to the wire.
A victory will write her name in the history books, making the Inala MP the first Australian woman to win two elections at either state or federal level.
Queensland Election in numbers:
- More than three million enrolled to vote
- 453 candidates standing
- 93 electorates
- Most populated: Clayfield (37,636)
- Least populated: Gregory (24,436)
- Biggest: Traeger (570,502 square kms)
- Smallest: South Brisbane (12 square kms)
- 1670 polling booths
- About 11,000 people temporarily employed by the Electoral Commission of Queensland for this election
- At least 12,000 6B pencils and 2000 sharpeners distributed
- $126.15 fine for not voting
