The state government created a safe Liberal majority for the new Parramatta City Council by the way it carved up neighbouring councils in the forced mergers process, a new analysis of Electoral Commission data suggests.

The analysis lends support to the views of NSW Labor leader Luke Foley and others that the new council was set up as a "rich super-council that the Liberals can never lose", but the government says it was just one of many mergers created under its forced amalgamations policy.

Election analyst Ben Raue from the Tally Room blog crunched the numbers on the new Parramatta boundaries based on voting patterns in local, state and federal elections since 2012, and found the new Parramatta was far more likely to be held by Liberals than the old.

"The shift north took out more Labor-friendly areas in Granville and added in more Liberal-friendly areas around the M2," he said.