VETERAN Greens MP Robin Chapple has pulled off a political comeback by being re-elected for a fourth term in the Upper House.

Mr Chapple was elected to the last spot in the Mining and Pastoral Region after a full count was finalised this afternoon.

He had been in danger of missing out to Labor’s Peter Foster but bridged a 225-vote deficit to claim a seat.

Mr Chapple will represent the region with two Labor MPs and one each from the Liberal and National parties.

The result confirmed One Nation's first Upper House MP, with electrical contractor Robin Scott also elected to the seat.

Both the Liberal and National parties lost an MP in the region, with former agriculture minister Mark Lewis one of the casualties.

Labor is on track to win 14 seats in the Upper House, while the Liberals are set for 10, and the Greens four seats.

The new Legislative Council will sit from May 22.