One NSW account holder has more $2 million waiting to be claimed, The Australian Taxation Office says.

"Our data shows there are some large amounts still lost," Assistant Commissioner Graham Whyte said on Friday.

In the last financial year, $420 million worth of super funds were reunited with their owners.

But there's still $17.5 billion unclaimed.

The ATO has released a list of the top ten postcodes with the highest amount of lost and unclaimed super:

1. 4740, QLD - $60.1 million unclaimed

2. 2170, NSW - $59.2mln

3. 4870, QLD - $57.5mln

4. 3030, Vic - $56.7mln

5. 4350, Qld - $53.3mln

6. 2560, NSW - $50.2mln

7. 2010, NSW - $45.7mln

8. 2000, NSW - $44.0mln

9. 6210, WA - $44.0mln

10. 3029, Vic - $43.8mln

Australian Associated Press