Labor has campaigned heavily in WA, with leader Anthony Albanese making four visits to the state since pandemic border restrictions were relaxed in March.
The opposition is confident it can win three Liberal-held WA seats - Swan, Pearce and Hasluck in a state that proved to be a stronghold for Prime Minister Scott Morrison at the last election.
A sea of red shirts is closely watching vote tallies on a big screen at the Belmont Sport and Recreation Centre in the seat of Swan located south of Perth's inner-city.
Campaigner Diane Mulroy said the volunteers had worked hard to get Labor's message across the electorate, by doorknocking 43,000 homes in the electorate since mid last year.
Fellow campaigner Roslyn Hackshaw told AAP they had reached a huge proportion of the community.
"That's in a seat with 110,000 electors. We reached almost everyone," she said.
Labor Premier Mark McGowan said on Saturday that West Australian voters could decide the outcome of the election.
High-profile WA independent candidate Kate Chaney says she will negotiate with the major parties should she win the contest in Curtin, a traditional stronghold for the Liberals.
Ms Chaney, a so-called teal independent, told Sky on Saturday that she anticipated the Curtin race would be very close.
"There's definitely a strong appetite for change from the people we've spoken to but it's clearly a big challenge unseating a safe Liberal seat," she said.
Independent candidates have been polling strongly across Australia in early voting on Saturday, with Zoe Daniel (seat of Goldstein in Victoria) and Allegra Spender (Wentworth, NSW) among several independents on track to oust their Liberal rivals.
In the event Curtin turns independent and Ms Chaney is in a powerbroker role, she said she would base her decision on which party to support on policies.
"I would make a decision made on the issues, not on the tribe," she told Sky.
"What I hear from voters in Curtin is that they're quite disillusioned with both sides and they really care about issues like integrity and climate and think that those issues are actually more important than who the prime minister is for the next three years.
"If my support is needed to form a minority government, I would negotiate with both parties and whether that is a formal or informal deal that can be part of the negotiation if it happens."
Since its creation in 1949, Curtin has been held by the Liberal Party with the exception of a three-year period in the 1990s when a Liberal-turned-independent held the seat.
Elsewhere in WA, Greens Senator Dorinda Cox spent the final day of the campaign visiting at least 12 polling stations across Perth.
"Across the electorates generally there is a really good feeling around the Greens," she said.
"What we are hearing from voters is that they do want to get rid of this government, that is a clear message, and a lot of people are taking our how to vote cards," she said.
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