The remaining votes in the WA election have been counted, with Labor narrowly missing out on a working majority in the Legislative Council by one seat.

The results mean Labor is likely to be reliant on the crossbench to pass legislation but that could change if it can court a Liberal MP to accept the president's position.

The North and South metropolitan regions were the last to be counted to determine the new make-up of the Legislative Council, with the result announced on Sunday afternoon.

From May, Labor will have 14 seats in the upper house and the Liberals nine, while the Nationals and the Greens will each have four.

There is also a string of minor parties including three One Nation MPs and one member from each of the Liberal Democrats and the Shooters, Fishers and Farmers.

The result means Labor will not have an absolute majority: combined with the Greens, it will have 18 seats which is equal to the other parties combined.

Liberal MP president could provide Labor with working majority

Simon O'Brien was dumped from the front bench during a 2013 reshuffle. ( ABC News: Rob Koenig-Luck )

The Government will need the support of the Greens and one other minor party, or the Opposition to gets its legislation passed.

If Labor can successfully appoint re-elected liberal MP Simon O'Brien as upper house president that would change.

Political analyst William Bowe said if Mr O'Brien doesn't become president, Labor will be relying on support from MPs like 26-year-old new Liberal Democrat Aaron Stonehouse, and others.

"It would be a huge tactical coup for Labor if they could indeed persuade Simon O'Brien to accept the president's chair because except on major constitution issues, they would be able to win the day with Greens support," he said.

Mr O'Brien, who was first elected to Parliament in 1996, was a minister for transport and commerce during the Barnett government's first term.

He was dumped from the ministry in 2013 and was not afraid to criticise the Government from the backbench, particularly on the issue of council amalgamations.

There is deep concern among Liberal MPs that Mr O'Brien may be tempted to accept the position.

Mr Bowe said the Liberal Democrats may align with Labor on social issues.

"Another hope for them might be that One Nation will not maintain its cohesiveness and you will have three effectively independent members and that may be you can pick them off in relation to one issue or another," Mr Bowe said.

"If they can't get Simon O'Brien particularly it is going to be a difficult situation for them because I think all the cross-bench members other than the Greens are recognised as being right of centre and not natural allies of Labor," he said.

High profile Greens MP Lynn Maclaren loses seat

Out-going Greens MP Lynn Maclaren was hopeful she would retain her South Metropolitian seat. ( Supplied )

There was disappointment for two-term Greens MP Lynn Maclaren, who lost her seat in the South Metropolitan region.

"I think what happened in South Metro was there was a huge swing to Labor and there was that strange anomaly with the Liberal Democrats being sooner on the ballot paper," she said.

But the out-going MP was optimistic about the party's future in WA's parliament.

"To have our Greens more than doubled in the upper house is a huge result for us and that will make a big impact on the whole state," she said.

WA's first Liberal Democrat MP elected

Western Australia's Parliament is set to play host to its first Liberal Democrat MP, after South Metropolitan region candidate Aaron Stonehouse was placed next to the similarly-named Liberal Party on the ballot paper.

The Liberal Democratic Party has benefited from a preference deal stitched up by "preference whisperer" Glenn Druery, which was designed to get minor parties into the Upper House.

The Daylight Saving Party was the designated recipient of preferences in the South Metro region.

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But the fact the Liberal Democrats were placed to the left of the Liberal Party on the ballot paper seems to have led to the party receiving more votes.

Soon after election day, ABC election analyst Antony Green said it seemed likely the success of the party was due to "voter confusion over party names".

In South Metro, the party polled 4.3 per cent, but in the other five regions, the vote was much lower.

In the Agricultural region it was 1.3 per cent, North Metro was 1.1 per cent, East Metro 1 per cent, South West 0.9 per cent and in the Mining and Pastoral region 0.7 per cent.

Who is Aaron Stonehouse?

Aaron Stonehouse was not at the declaration at the Northbridge Count Centre because he had work commitments.

Liberal Democrat Aaron Stonehouse has won an Upper House seat. ( Supplied: Liberal Democrats )

The party has supplied information about Mr Stonehouse, saying he is a 26-year-old call centre manager from Rockingham who joined the Liberal Democrats in 2014.

Born in Subiaco, Mr Stonehouse graduated from Maranatha Christian College in 2007.

The party said: "A single man, he enjoys kayaking around Warnbro Sound and Shoalwater when time permits, and is a recreational shooter.

"Aaron enjoys heavy metal and attends gigs in Perth when he can."

The party said Mr Stonehouse supported the "small government ethos of the Liberal Democrats, which means he will never vote for an increase in taxes or a reduction in liberty".

The Liberal Democrats had a negligible campaign profile in the lead-up to the WA election.

The party was most recently in the news in January, when federal Liberal Democrats Senator David Leyonhjelm made an apparent joke about the incident in Melbourne's Bourke Street when a car was driven into pedestrians.

Senator Leyonhjelm, an opponent of gun control, took to Twitter to state "Probably one of those semi-automatic assault cars".

He was heavily criticised for the tweet.