Billionaire Clive Palmer is on track to enter federal parliament.
The latest round of vote counting shows the Liberal-National coalition ahead in 87 seats.
Labor is ahead in 57 seats, with the Greens' Adam Bandt holding Melbourne, Bob Katter retaining his seat of Kennedy, and independent Andrew Wilkie returning in Denison.
The Australian Electoral Commission on Monday afternoon posted two-candidate preferred counts on its website for the seats of Fisher, Fairfax, Indi and Mallee.
It shows Mr Palmer is ahead of his Liberal National Party rival Ted O'Brien by 1920 votes in the Queensland seat of Fairfax.
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Liberal frontbencher Sophie Mirabella trails independent Cathy McGowan in the Victorian seat of Indi by 1754 votes.
Former Howard government minister Mal Brough is 1521 votes ahead of Palmer United Party's Bill Schoch in Fisher.
The Nationals' Andrew Broad looks set to take the Victorian seat of Mallee, leading his Liberal rival Chris Crewther by 785 votes.
Among the seats listed as "close" is the NSW seat of Barton, with Labor candidate Steve McMahon 79 votes ahead of the Liberals' Nic Varvaris.
In Eden-Monaro, former Labor minister Mike Kelly is 616 votes behind Liberal candidate Peter Hendy.
Labor MP John Murphy is trailing Liberal challenger Craig Laundy by 652 votes in the NSW seat of Reid.
In Victoria, Labor MP Rob Mitchell is 72 votes ahead of the Liberals' Donna Petrovich in McEwen.
Labor candidate Peter Freeleagus is 141 votes ahead of the Liberal National Party's Michelle Landry in the Queensland seat of Capricornia.
The seat of Petrie was moved out of the "close" category on Monday afternoon. Former parliamentary secretary Yvette D'Ath is 809 votes behind the LNP's Luke Howarth in the Brisbane-based seat.
The Liberals will pick up a Senate seat in the ACT.
Liberal candidate Zed Seselja achieved just over 33 per cent of the vote in counting on Monday afternoon, pushing him ahead of the Greens' Simon Sheikh.
Labor's Kate Lundy has already retained her seat.
