Postcode 3042 suburbs include: Airport West, Keilor Park, Niddrie. 3046, Glenroy, Hadfield, Oak Park. Broadmeadows, Dallas, Jacana.

Postcode 3055 suburbs include Brunswick South, Brunswick West, Moreland West.

Postcode 3060 suburbs include Fawkner. 3064, Craigieburn, Donnybrook, Mickelham, Roxburgh Park and Kalkallo.

Mr Andrews said police would ''actively, actively'' enforce the lockdowns.

"They will be patrolling throughout these communities and if people are out of their home then they will be politely asked 'why are you out of your home?' and if you are out of your home for anything other than a permitted reason then financial penalties apply - on-the-spot fines apply," he said.

"I do sincerely hope it doesn't come to that but this needs to be taken seriously."

It comes as Victoria reported another 64 new cases of coronavirus on Tuesday, down from 75 on Monday.

It marks two weeks of consecutive double-digit case growth in Victoria. Eleventh-hour emergency meetings were held by authorities to discuss geographical lockdowns to limit the movements of residents living in about 10 suburbs across the city’s north, west and southeast.

Of the new cases on Tuesday, 13 are linked to known outbreaks. Twenty new cases have been identified through routine testing and another 31 remain under investigation.

Victorian Premier Daniel Andrews said more than 93,000 plus tests have been conducted since the testing blitz was undertaken in hotspots last week.

About 37,000 doors have been knocked on, Mr Andrews said.

There have been some 233 new cases of coronavirus since last Thursday with the majority of residents located in Broadmeadows, Fawkner and Albanvale.

But the Premier said more than 900 residents have refused to get tested.

"I do feel obliged to inform you that in Broadmeadows and Keilor Downs alone, some 928 people refused to be tested," Mr Andrew said.

"Now I can't change that. That's happened. All I can do is encourage those people come forward and get tested today."

On Monday, the state's Chief Health Officer Brett Sutton warned the coronavirus outbreak "will get worse before it gets better" after 75 new cases were revealed on Monday - the fourth-highest number since the pandemic began and the highest since March.

Mr Andrews and Prime Minister Scott Morrison spoke at length on Monday about the Victorian outbreak as the pair agreed on the deployment of 800 federal workers to help under siege state authorities bring the situation under control.

The federal government believes, on the advice of the Australian Health Protection Principal Committee, that suburb-by-suburb action needs to take place.

The Morrison government has agreed to provide 100 managers to support community engagement, 500 staff to form public engagement and door-knocking teams, and 200 clinical staff to undertake testing at fixed sites, to release clinical staff to participate in mobile testing in hotspots.

Mr Morrison on Monday pledged to give Mr Andrews anything he needs to combat the outbreak, which threatens to put a handbrake on the easing of border restrictions and slow the nation’s economic recovery.

"This is a public health bushfire - just as we help out other states in summer, help is coming from across the nation now - and we are grateful for that," a Victorian government spokeswoman said in a statement.

Professor Hamish McCallum from Griffith University said the state is experiencing a second wave of the virus.

"The question is whether it is a ripple, or the start of a tsunami," he said.