May King will contest the September 14 election as part of the Palmer United Party, founded by Queensland billionaire Clive Palmer.

A former Wingecarribee Councillor of four years, Ms King said she would focus on health and transport issues as well as raising the tourism profile of the Highlands.

She also said she would work to boost job growth in the region.

"I love the area and I would love the opportunity to represent it," Ms King said.

"I'll be getting my teeth into all these issues further down the track.

"It'll be difficult, I know. I know the Highlands very well but I'll make it my business to find out more about the Illawarra."

Ms King said she decided to run in the September election after she became frustrated with the way many politicians were "too busy fighting and did not focus enough on policy".

While Ms King lives in Wingello, which is in the electorate of Hume, she remains the only candidate to contest Throsby who lives in the Southern Highlands.

She is the electorate's only Highlands-based candidate after National Party member Nick Cleary withdrew from the race in March, eventually being replaced by Gary "Angry" Anderson, who lives in Sydney.

Ms King is the latest in the list of Throsby hopefuls, which includes Mr Anderson, Liberal Party candidate Larissa Mallinson and the Greens' Peter Moran.

Incumbent Labor MP Stephen Jones, who currently holds the seat, has been challenged for pre-selection from inside his party by Wollongong nurse John Rumble.

Either Mr Jones or Mr Rumble will be confirmed as Labor's candidate after a vote on June 15.