The cash is part of the 'forgotten money' account held by Revenue NSW and includes share dividends, trust accounts, refunds, commissions, deceased estates and money from a range of other sources.

The 2800 postcode is ranked second behind Wollongong ($742,777) on the list of regional suburbs with Newcastle ($670,558) third.

Dubbo ($434,547) is ninth and Bathurst ($429,663) tenth.

Revenue NSW spokesperson said the money usually came from simple transactions that were overlooked or forgotten, transations like an electricity bill inadvertently paid twice.

"Or you may have paid for a TAFE course and then been unable to do it, for some reason TAFE can't find you to refund it so they give it to the government," she said.

Orange's figure of $708,025 represents 2027 transactions and is part of a state-wide pool of $467 million. The Sydney postcode accounts for most of that with $14,616,327.

NSW Minister for Finance and Small Business Damien Tudehope encouraged people to get online to see if they had money in the account.

"The largest single amount held on the unclaimed money register is more than $1 million from a deceased estate in Cabramatta, while there are 10 amounts of more than $500,000 waiting to be collected by rightful owners," he said.

Mr Tudehope added there was also more than 255,000 unpresented cheques worth $108 million waiting to make their way into people's accounts.,

"We know many people are doing it tough, especially during the COVID-19 pandemic with most households having to keep a close eye on their budget," he said.

"This is why I am encouraging people to check their eligiblity on the Revenue NSW website to see if you are owed any money."

The unclaimed money register an be found at revenue.nsw.gov.au/unclaimed-money/search.

Our journalists work hard to provide local, up-to-date news to the community. This is how you can continue to access our trusted content:

Send a letter to the editor using the form below