Three of the four major groups contesting the election oppose further forest clearing on Newcastle's western fringe.
Save Link Road Forest Campaign, Community for Sustainable Development and Green Corridor Coalition recently asked candidates to take a pledge on the issue.
Labor, Greens and the Ross Kerridge Independents supported the pledge. Only Liberals failed to give commitment.
"We are confident that at least two councillors from every ward who have made the pledge will be elected," Save Link Road Forest Campaign spokesman Ian McKenzie said.
"In addition, every lord mayoral candidate except Liberal has committed to the pledge, making it virtually certain that at least nine of the 13 councillors will have promised to oppose clearing of forest for development.
"This is a wonderful result for Newcastle's last unprotected areas of natural environment and for the many Novocastrians who care about the forests and the wildlife that inhabit them."
Liberal councillor Callum Pull said he did not sign the pledge because the supply of housing needed to be prioritised in the city's west.
"I have consistently made my view known, which is that this whole argument is just a farce. There is no huge green corridor that needs protecting. We need more housing here in Newcastle," Cr Pull said.
"Groups like these are holding up strong and viable housing developments in our city that are ready to proceed."
Mr McKenzie said Novcastrians overwhelmingly wanted to retain the city's remaining native forest.
"It is a message that I hope the NSW Planning Minister, the NSW Environment Minister and the local members of Parliament hear very clearly," he said.
"The forests are vital for biodiversity and the protection of threatened species such as the koala and the squirrel glider. The forests are vital for sequestering carbon and combating climate change."
