Support for the Coalition has dropped 6 per cent since last year’s federal election, with Malcolm Turnbull suffering a backlash in South Australia and losing ground in Queensland, a Newspoll analysis shows.

But the Prime Minister has kept his lead over Opposition Leader Bill Shorten as preferred prime minister in every state and among every age group, including young voters, the quarterly analysis for the The Australian shows.

South Australian voters have turned against the government more than in any other state over the past six months, putting Labor ahead 56 to 44 per cent in two-party terms.

The Coalition has also lost 10 percentage points in Queensland since the July election to drive its primary vote down to 33 per cent, as One Nation holds the support of 16 per cent of state voters.

But the Newspoll analysis shows the government has lifted its primary vote in Victoria by three percentage points over the past three months.

Labor’s primary-vote support in WA has surged almost 10 percentage points since the July election to 42 per cent, while the Coalition’s support has fallen by nine percentage points to 40 per cent.

The survey of 6843 voters from April to June shows Labor leading the Coalition by 53 per cent to 47 per cent in two-party terms at a national level.