A hung parliament in Queensland is still a possibility with tight contests underway in three seats even as the Labor Party says it is optimistic it will win the 45 seats needed to govern without the support of crossbenchers.

The ALP achieved one of the biggest swings in Australian political history in Saturday's state election, which saw Liberal National Party (LNP) leader and Premier Campbell Newman, along with a swag of his MPs, lose their seats.

Labor has so far secured 43 electorates in the poll but the final result in some seats may not be known for a week.

Labor's campaign director Anthony Chisolm said his calculations showed the party should scrape over the line.

"We think it is still possible for the Labor Party to achieve 45 seats; we are ahead in 44 at the moment and there are still probably another five in doubt, so you would much prefer to be in our shoes," he said.

"We are optimistic we can get to that 45."

However, the ABC's election analyst Antony Green said a hung parliament was a real possibility with predictions Labor would win 44 seats this election and the LNP 42.

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Green said all eyes would be on tight contests playing out in three seats — Mansfield, Whitsunday and Maryborough.

At the close of counting on Sunday night the LNP was leading in Mansfield and Whitsunday and the ALP was ahead in Maryborough.

Potential future premier and Labor leader Annastacia Palaszczuk was also optimistic about the party wining the seats needed to form a majority government.

Should it come to a hung parliament, Katter's Australian Party has two seats and is willing to do a deal with Labor.

Independent Nicklin MP Peter Wellington said he was also prepared to negotiate with Labor.

Electoral Commission of Queensland's Carrick Brough said the results of the final count could take up to a week to be known due to the large number of postal votes.

"It's because of the large amount of postal votes — we took over 306,000 postal votes — and postal votes don't have to be returned until 10 days after the count," he said.