The federal electorate of Forrest, which includes Augusta Margaret River, Bunbury, Busselton, Capel, Harvey and Nannup has voted in favour of same-sex marriage.
Of the 80,897 electors who returned a postal vote 63.8 per cent (or 51,612 people) voted yes and 36.2 per cent (or 29,285 people) voted no.
In Western Australia 801,575 people – or 63.7 per cent of electors – voted yes.
Overall, 61.6 per cent of Australians who returned a ballot voted in favour of a change in the law to allow same-sex marriage.
There were 4.9 million Australians (or 38.4 per cent) who voted no.
Almost 80 per cent of the 16 million Australian eligible to cast a vote returned a survey form.
Prime Minister Malcolm Turnbull said on Wednesday morning he wants legislation enacting the outcome of the survey, which he described as “unequivocal and overwhelming”, passed through parliament by Christmas.
“My commitment was to give every Australian their say – that has been done,” he said.
“They have said yes...It is our job to do that.”
The rest of the State
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.
Western Australia recorded the third 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 electorates of Fremantle and Perth also had yes votes above 70 per cent.
The no vote was highest in the electorate of O'Connor, accounting for 43.8 per cent of the vote. The electorate covers the state's Great Southern and Goldfield regions including Albany, Kalgoorlie, Esperance and Collie.
The survey results revealed 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.
ABS chief statistician David Kalisch said the participation level for a voluntary survey was "outstanding" after more than 12 million people had their say.
"It shows how important this issue is to many Australians," he said.
"Participation was strong across all ages, with all age groups having higher than 70 per cent participation.
"Participation in the survey was slightly higher at older ages and slightly lower for younger age groups.
"It's worth noting our youngest on the electoral role, the 18 and 19 year olds responded strongly, with around 78 per cent participating."
Prime Minister Malcolm Turnbull has committed to legalising same-sex marriage before Christmas.
He has indicated WA senator Dean Smith's same sex marriage bill was his preferred option but that it was up to MPs to decide if the bill is taken forward.
"Now it is up to us here in the Parliament of Australia to get on with it, to get on with the job the Australian people have tasked us to do and get this done this year before Christmas," he said.
Mr Smith's bill seeks to redefine marriage as 'a union of two people, to the exclusion of all others, voluntarily entered into for life' - removing any reference to gender.
The senator told Radio 6PR on Wednesday he would put a notice before the senate today to introduce the bill, which he claimed had cross-party support.
