Tasmanians have lost or not claimed $404.3 million in superannuation, at an average of $8429 per account.
Launceston and surrounds ($40.2 million), Bellerive and surrounds ($20.3 million) and Devonport and surrounds ($17.2 million) are the state's unclaimed and lost super hot spots, according to Australian Taxation Office figures for June 30.
Devonport and surrounds had 2714 lost or unclaimed super accounts, at an average of $6324 per account.
Launceston and surrounds had 4420 such accounts at an average of $9086.
Other totals included:
- Ulverstone, 1351 accounts, averaging $7148;
- Burnie, 1563 accounts, averaging $6890; and
- Wynyard, 812 accounts, averaging $7603.
There were 47,690 Tasmanian lost or unclaimed super accounts in total.
The tax office said lost and unclaimed super accounts totalled more than $20.8 billion nationally.
The ATO is acting to reunite people with their lost and unclaimed super.
"Often people lose touch with their fund by simply changing jobs or moving home," assistant commissioner Graham Whyte said.
"It's important to know that this doesn't mean it's lost forever.
"Getting back in touch is easier than you think."
The ATO said new legislation meant it could now start reuniting Australians with their super without them needing to do anything.
It said it would inform them when it had done so.
The new law required super funds to report and pay low-balance, inactive accounts to the ATO.
"We are now working to reunite Australians with these accounts by either transferring it into an active super account or directly into their bank account where the amount is less than $200 or the member is aged over 65 years," Mr Whyte said.
He said the process had led to some "incredible examples" of people getting meaningful boosts to their retirement savings.
One woman who lost her house in a bushfire was later reunited with more than $600,000 of unclaimed super.
"As she was over 65, we were able to pay that money directly to her and she is now able to use this money to rebuild her life," Mr Whyte said.
" ... it wasn't until the woman reached out to us that she realised she had so much super."
Another woman, aged 68, would be directly paid more than $1.5 million in unclaimed super with which she had lost touch.
Mr Whyte said anyone who thought they might get a direct payment should log into ATO online via MyGov and make sure their bank account details were up to date.