Pauline Hanson's One Nation party is now a major force in Australian politics, having secured four Senate seats in an independent crossbench that has swelled to 11.

The anti-Islam party scored two seats in Queensland, including one for Ms Hanson, and one in NSW, when results from the July 2 federal election were finalised in those two states on Thursday morning.

Adding to a seat already confirmed in Western Australia earlier this week, One Nation will have four senators when the 45th Parliament begins later this month. That is one more than the other major new force, the Nick Xenophon Team, which won three Senate seats in South Australia.

Liberal Democrat senator David Leyonhjelm was also re-elected in NSW, swelling the size of the independent crossbench to 11 (from eight in the previous Parliament).