Perth's western suburbs deliver strongest yes vote in WA

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Western Australians have voted above the national average in support of same-sex marriage, with more than 1.2 million people across the state taking part in the postal survey.

The Australian Bureau of Statistics announced the survey results on Wednesday morning, with the yes vote attracting 61.6 per cent of national votes compared to 38.4 per cent against same sex marriage.

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Western Australia recorded the second highest yes vote in the nation with 63.7 per cent, compared to 36.3 per cent who ticked no.

Residents in the federal electorate of Curtin were most likely to vote yes, with 72.2 per cent voting in favour of marriage equality.

The electorate includes Perth's western suburbs.

The no vote was highest in the electorate of O'Connor, with 43.8 per cent of the vote. The electorate covers the state's Great Southern and Goldfield regions including Albany, Kalgoorlie, Esperance and Collie.

People in the Perth metropolitan area were more likely to vote yes, with nearly two thirds supporting marriage equality (64.6%) compared to 60.9 per cent across regional WA.

Participation rates in WA were just under the national average, with 78.4 per cent of people voting compared to 79.5 per cent nationally.

State government environment minister Stephen Dawson was one of hundreds of people who attended the Northbridge Piazza on Wednesday morning to learn the outcome of the vote.

Mr Dawson and his partner Dennis Liddlelow have been strong marriage equality supporters and were one of the first to marry in 2013 in Canberra when the law briefly allowed it before the decision was overruled by the High Court.

"It's a fantastic result, I'm very proud of Western Australians and also Australians in general," he said.

"This is a momentous day for the LGBTI community.

"Our Federal politicians must act without haste, they've had the power all along and now the people have told them to legislate and now they must do that immediately."

Mr Dawson said he would speak to Mr Liddlelow about getting married "again", after their first marriage was deemed invalid after just five days.

"It has been a long time coming for myself and my partner," he said.

Prime Minister Malcolm Turnbull had promised to legalise same-sex marriage before Christmas if the yes vote was successful.

More to come...