Victoria's political leaders have voted in their home electorates, before the polls close at 6:00pm (AEST) in what is expected to be a close election.

Premier Denis Napthine voted in his electorate at Portland on the south-west coast, and Opposition Leader Daniel Andrews voted in his electorate of Mulgrave, in the eastern suburbs of Melbourne.

Dr Napthine left home at 7:00am to campaign on the Portland marina and then did four back-to-back television interviews.

Joined by his son Tom, Dr Napthine travelled to Port Fairy, in the far west of the state, before making his way back to Melbourne for the election count.

Dr Napthine said he was confident the polls were wrong and the message he had received from Victorians was that the Coalition would be given another term.

"They're telling me they are going to vote on who they can trust to run the economy well, who they can trust to deliver the 21st century schools and hospitals, who they can trust to use the economic strength we have in Victoria to build the infrastructure we need like the East West Link," he said.

Mr Andrews also spent the morning in television and radio interviews, making final pitches to Victorians for a Labor Party vote.

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He voted at Albany Rise Primary School in the Melbourne suburb of Mulgrave with his wife, their three children and his parents.

Mr Andrews will spend his last hours of campaigning this afternoon handing out how-to-vote cards at electorates in Melbourne's sandbelt area, including the seats of Bentleigh, Carrum, Mordialloc and Frankston.

He said Victoria had gone backwards under the Coalition and Victorians wanted change.

"Now it will be a matter whether the Victorian community want four more years like the last four, or whether they want a Labor government that will work really, really hard to deal with so many of the challenges but in an optimistic and positive way," he said.

The Greens are trying to unseat Labor in the four inner-city seats of Melbourne Richmond, Brunswick and Northcote, and hope to win the balance of power in the Upper House.

Leader Greg Barber said it was a reasonable proposition.

"None of the big parties are getting anything like a majority and in the Upper House where proportional representation is the counting method, you would expect to see a balance of power Upper House," he said.

Victorians queue to cast their votes

While more than 1.1 million people, or 30 per cent of those enrolled, had already cast their votes at early polling booths around the state, some voters took to social media to complain of queues taking up to 1.5 hours.

Paul Thornton Smith from the Victorian Electoral Commission said there had been reports of queues in Richmond, Elwood, St Kilda town hall.

"It is not unusual that there are queues. They staff polling stations on the basis of the numbers who attended the previous year plus some extra for growth," Mr Thornton Smith said.

"The queues are fleeting, scattered and unpredictable but nothing out of the ordinary."

Polls point towards Labor victory

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Labor appears poised to win a slim majority in today's state election in Victoria, the latest polls suggest.

But the Coalition has been gaining ground.

A Newspoll survey, conducted Friday and published in The Weekend Australian today, tipped a Labor victory, with the party holding a 52 to 48 per cent lead on a two-party preferred basis.

If the poll were replicated today, Labor would pick up an extra six seats, giving it a parliamentary majority.

But the survey showed the Coalition had gained a percentage point of the primary vote.

The latest Fairfax Ipsos poll also had Labor leading on a two-party preferred basis, but by a slimmer margin than in the last survey.

With the preference flows applied from the 2010 election, the parties were neck and neck.

Both polls show Labor with a slim majority as voters head to the ballot box.

Polling reveals undecided voters: Treasurer

Treasurer Michael O'Brien said it was good news that the polls had tightened.

"What the polls show is that it is very, very close and there are a number of undecided voters today who will make the decision as to who governs this state for the next four years," he said.

"The Coalition will deliver the East West Link, the airport rail link and the Melbourne rail link and keep the budget in surplus.

"Labor wants to rip up contracts, won't put a shovel in the ground on building the Melbourne Metro rail tunnel, and will put the budget into deficit."

Peter Ryan, the leader of the Victorian Nationals and deputy premier of Victoria, said it would be a tight contest and every vote would count.

"I urge, therefore, those of us who live in rural and regional Victoria to give careful consideration to what you do," he said.

He said the Opposition would strip funds out of regional projects to fund Melbourne-based priorities.