Ballarat residents were among the worst in the state for losing superannuation in the latest financial year.
More than $28 million in superannuation is currently lost or unclaimed in the 3350 postcode, with almost $4 million going begging in the last year alone.
Only Glen Waverly and Coburg saw more super lost in the previous year.
"Our data shows there are some large amounts still lost," Assistant Commissioner Graham Whyte said on Friday.
“It’s important to remain engaged with your super fund through all stages of your career, not just when you are ready to retire.
“The data also reveals that more than a third of Australians still hold two or more super accounts.
“While we know that some people intentionally maintain a number of accounts, many are unaware that their super may be sitting in multiple accounts and possibly being eroded by fees.”
In the last financial year, $420 million worth of super funds were reunited with their owners.
But there's still $17.5 billion unclaimed throughout Australia.
For information on how to manage your super and view all your super accounts including lost and unclaimed super, visit ato.gov.au/checkyoursuper.
To find out how much lost super is in your postcode and to see other superannuation statistics visit ato.gov.au/lostsuper.