Pauline Hanson One Nation candidate Rodney Culleton has won one of the 12 West Australian Senate seats, joining five Liberals, four Labor and two Greens, the Australian Electoral Commission says.
Mr Culleton secured 11th position for One Nation in the final tally from the July 2 federal election.
The list was topped by Finance Minister Mathias Cormann and Labor's Sue Lines.
Greens co-deputy leader Scott Ludlam scored third place, having almost lost his seat in 2013 during a chaotic WA count which resulted in the state having to rerun its Senate election.
Employment Minister Michaelia Cash was fourth.
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Indigenous leader Pat Dodson won the seventh slot for Labor, while the opposition's Louise Pratt was returned in 10th place after losing her seat in 2013.
Greens stalwart Rachel Siewert drew last place behind One Nation.
The formal declaration of the WA Senate poll will be made on Tuesday.
