Dubbo City Council and Wellington Shire Council were merged on May 12, 2016. It was one of 19 amalgamations across NSW.

But former mayors Allan Smith, Mathew Dickerson and Greg Matthews are still waiting to see the benefits promised by the state government.

There are four things the former mayors are calling for: the original data and reports that were used to make the decision to amalgamate the councils, the government to show how the communities are better off as a direct result of the amalgamation, the ward system for local government elections to be scrapped, and a plebiscite to determine if the two former council areas still want to remain together.

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Mr Dickerson said the amalgamation was causing "ongoing detriment" to the entire Orana region.

"It is no surprise that the three men who pushed the flawed amalgamation through the State Parliament are no longer in those positions," he said.

"I believe the state government forgot their role - any democratically elected government should represent the people that elected the government. I believe that the amalgamation was a classic case of the party coming before the people and that is to the ongoing detriment of residents in Wellington and Dubbo and the entire Orana region."

Mr Matthews said he was "confident in saying both Dubbo and Wellington would be in a better position today if the amalgamation had not occurred".

Meanwhile, Mr Smith said a community vote showed that 80 per cent of Dubbo residents were against the merger, yet the the NSW government pushed ahead.

"With promises of significant benefits from the amalgamation, it is time for the government to clearly demonstrate those benefits," he said.

"Residents are still waiting for the original KPMG report that recommended the amalgamation but after five years it is time to demonstrate the supposed benefits to our community."

At the time of the merger, then-Deputy Premier Troy Grant said the move would deliver improved services for the region.

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