Record levels of young voters have enrolled in this year's election and data analysed by Hack reveals they could decide the outcome in more than 20 marginal seats.

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Analysts have told Hack young voters are up for grabs by the major parties because they mostly vote on policy instead of for specific parties. triple j's research has also backed that up.

This year, there's a record number of Australians who are enrolled to vote with almost 97 per cent of eligible voters on the roll. That's in part thanks to the highest enrolment rate in history of young voters, at 88.8 per cent.

Around 100,000 Australians enrolled to vote in the lead up to the same-sex marriage survey, the majority of whom were under 25 at the time.

So where do the young voters live?

Most of the seats with the highest proportion of young voters are in the suburbs of capital cities. That's contrary to popular belief that young people usually live in the inner city.

The exceptions to this trend are seats covering inner-city Brisbane and Melbourne which encapsulate large student populations.

These are the top ten seats with the highest percentage of voters aged 18 to 29:

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Whatsapp These are the top ten seats with the highest percentage of voters aged 18 to 29.

Seventy-five seats in this election have a higher than average proportion of young voters. Of those electorates, 22 are marginal seats.

Could young voters decide the outcome in marginal seats?

A seat is marginal when the party which currently holds it won less than 56 per cent of the vote after preferences were distributed in the last election. If you want more details on that click here.

That means marginal seats where there's a high proportion of 18 to 29 year olds could put the power in their hands.

The seat of Herbert in Townsville is held on an incredibly slim margin of 0.02 per cent by Labor's Cathy O'Toole. Lindsay in Western Sydney is held by Labor's Emma Husar who is retiring at this election and the seat is on a 1.1 per cent margin. In both of these seats, around a quarter of people enrolled to vote are under 30. With such tight margins, these seats could easily swing to a different party.

Other seats where young voters hold power are Immigration Minister Peter Dutton's Queensland seat of Dickson which is on a really tight margin of 1.7 per cent and Labor's Anne Aly's Perth seat of Cowan which is on a 0.7 per cent margin. Attorney General Christian Porter's seat of Pearce is also marginal and has a high proportion of young voters.

What about policy?

Hack has analysed data on the policy areas most important to young voters in the seats with the highest proportion of 18 to 29 year olds. Let's see how they're being serviced at the moment and where the major parties stand.

Click through to the policies that matter to you:

Unemployment is a major problem in these seats

Labor holds all but one of the seats with the highest percentage of people who are unemployed and not studying. Six of those seats are in Sydney's southern and western suburbs.

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We know young people are more likely to be unemployed than the rest of the country and both parties have outlined their plans to tackle the problem.

The centrepiece of the Coalition's youth jobs creation policy is the JobsPaTH program which is expected to help 120,000 young people into paid internships over four years.

Labor has announced it will scrap that program and has spent a lot of time, along with the Greens, promoting its plan to fully restore public holiday and weekend penalty rates that were thrown out by the Fair Work Commission.

Both major parties are on a unity ticket when it comes to apprenticeships - they want more positions created. But they differ on how many.

And when it comes to Newstart, the main income support for unemployed people, the Greens are the only major party to commit to an increase of $75 a week.

The Coalition has already announced changes to the Jobactive program - the system to show the government you're looking for a job while getting welfare payments. Labor is yet to announce any overhaul.

Here's an overview of major party policies on jobs and youth unemployment.

If you're voting based on climate policy, there are clear party differences

Climate change and the environment have come up, in several surveys, as one of the most important policy areas for young voters.

It's impossible to assess climate change policy on an electorate-by-electorate basis, but each party has starkly different approaches to this issue especially in terms of an emissions reduction target.

The Coalition has committed $2 billion to the Climate Solutions Fund to pay big emitters to reduce their carbon footprint and it has a target to reduce greenhouse gas emissions by up to 28 per cent by 2030.

Labor's emissions target is a 45 per cent reduction by 2030 with half of our energy resources coming from renewable sources. Plus, it would fine the 250 biggest polluting companies if their emissions exceed a cap.

The Greens' policy goes even further with 90 per cent of energy to come from renewable sources by 2030.

A major aspect of this issue in the upcoming election is the Adani coal mine, which lies in Herbert - the electorate that includes Townsville. Herbert is a really marginal seat with a high proportion of young voters (23 per cent).

Adani is a big focus because it's a 'carbon bomb' that would increase global emissions and also put the Great Barrier Reef at risk, according to several experts.

At the moment, the Greens are the only major political party to promise it will stop the project. The Coalition has approved plans for it to progress to the next stage. Labor hasn't outright committed to stopping the coal mine either. The party's said it will follow the approvals process and science at hand.

Find out more about what the major parties are doing in other realms of environment policy here.

Want a cheap house? Buy off the East Coast or in the regions

We've been constantly hearing that housing is REALLY expensive and as a young person, entering the market is still a tough feat.

Hack has analysed new data from the Australian Bureau of Statistics which shows most of the seats with the highest mortgages are in Sydney... no surprises there.

When it comes to cheaper housing, electorates in regional NSW, like Parkes and Riverina, along with the Adelaide seat of Spence have the lowest median monthly mortgages. They're sitting at around $1,300 there.

The vast majority of electorates with the highest median mortgages are held by Labor.

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When it comes to policy on housing affordability, Labor's plan is to limit negative gearing and halve capital gains tax discounts.

In short, if you buy an investment property that makes less money (in rent) than it costs (in repayments) then right now, you can claim that loss on tax - which is negative gearing. But Labor wants to limit that to investors who only buy new houses.

Capital gains is how much you make on a property once you sell it - but you have to pay tax on that profit. Investors are given a 50 per cent concession on that tax but Labor is proposing to reduce that to 25 per cent.

The party says both of these changes will help first home buyers enter the market by making property more affordable.

But the Liberal Party is critical of Labor's plan and has said it could slow Australia's economic growth.

The Coalition hasn't announced a new policy targeting first home buyers per se, but has campaigned on its existing program of First Home Super Savers Accounts, which allows people to salary sacrifice $30,000 for a house deposit.

Mental health is a big focus of this election

Nearly a fifth of people in Australia who use Medicare-subsidised mental health services are under 25.

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The statistics in this area are really lacking so it's difficult to analyse how young people are being serviced when it comes to mental health services. That also makes it hard to hold politicians to account in these areas. Countries like the UK have a mental health target - something Australia doesn't measure.

After speaking to several organisations in this space, the only public data we could obtain was on the proportion of young people who have used Medicare's mental health services in each state.

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Mental health has become a central policy for the Coalition since the beginning of its campaign. It has announced $737 million worth of measures for mental health programs and suicide prevention strategies.

Headspace gets a large proportion of that with $111 million. Labor's also on board with expanding Headspace, promising more centres and extra Medicare-supported treatment for clients who access the service.

However, some industry observers are concerned putting so much funding into one model only treats some young Australians facing mental health problems

Mental health researchers have said funding for mental health services need to be diversified so people with different problems can find the right treatment they need.

Both parties have more commitments in their mental health policies. Read more here.

Worst rates of young people finishing school are in regional areas

The worst rates of young people finishing school are in regional areas.

Lingiari, which covers all of the NT except for Darwin and Palmerston, has by far the worst rate of Year 12 attainment.

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Lingiari is predominately made up of remote Aboriginal communities as well as towns like Alice Springs and Katherine.

This is a key seat in the upcoming election and despite being held by Labor for decades, there's concern the NT's Labor Government's current unpopularity could lead a swing in the opposite direction.