Attorney-General Christian Porter and Aged Care Minister Ken Wyatt each won their marginal seats on Saturday night.

Christian Porter retained Pearce with a swing towards him, obtaining more than 56 per cent of the two-party preferred vote after more than half the votes were counted.

He thanked his supporters and also took a swipe at unions, Get Up and the ALP.

"This has been the grassroots movement that they said they were going to bring against us ... this is how we won this seat," he said.

Mr Porter told reporters the election was closer than anyone had predicted and polls were not good at predicting things on a more granular level.

"Australians instinctively, particularly Australians who work and pay a mortgage, don't like to be taxed more," he said.

"So if you have a massive big target, high taxing agenda, $387 billion worth of new taxes, that is a really hard pony to sell."

Mr Wyatt, whose campaign was bolstered this week by a visit from former prime minister John Howard, was again the victor in Hasluck.

Swan was a tight battle but Steve Irons appears to have fended off the challenge from Hannah Beazley, daughter of WA Governor and former federal Labor leader Kim Beazley.

She is yet to concede defeat but said it was not the result she wanted.

"My number one aim was to get to today and leave no stone unturned, and we did just that," Ms Beazley said.

Labor also targeted the seat of Stirling following the retirement of former Liberal minister Michael Keenan, who held the seat since 2004.

But Stirling was won by the Liberal's new candidate, former soldier Vince Connelly.

Canning was the fifth seat Labor had earlier had their eye on, but there was never really a doubt that conservative MP Andrew Hastie would keep his seat.

In a possible minor victory for Labor, Egyptian-born Anne Aly may be able to hold onto Cowan.

The counter-terrorism expert became the first Muslim woman elected to federal parliament in 2016 with a margin of just 0.7 per cent, but has faced tough competition from the Liberal's Isaac Stewart.

Meanwhile, Liberal candidate Celia Hammond easily won the blue-ribbon seat of Curtin vacated by former foreign minister Julie Bishop, although there was a swing against her.

In the senate, Clive Palmer's United Australia Party will not pick up a WA seat despite the millions of dollars poured into the campaign.

Greens senator Jordan Steele-John looks set to be re-elected but One Nation's Peter Georgiou could miss out.

Australian Associated Press