You could be sitting on a small fortune - or at least a nice windfall - and not even know it.

NSW residents are being urged to reconnect with their money and get some extra cash to spend, by checking for any unclaimed money held by Revenue NSW.

Minister for Finance Damien Tudehope said more than $461 million in unclaimed money was sitting with Revenue NSW that would be better reunited with its rightful owners.

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"COVID-19 has also seen many families tighten their budgets. A quick search could help identify money that is sitting, waiting to be claimed through Revenue NSW, that could be used these Summer holidays," Mr Tudehope said.

"This money belongs to the people of NSW and I want to make sure it goes back to them."

How much money is sitting unclaimed for Mid-Western residents? The Mudgee Guardian broke down the data by postcode.

Almost $17 million has been paid to claimants since December last year.

Revenue NSW holds more than a million unclaimed items from private companies, State Trustees, local councils and government agencies that can't be returned to the owner because their contact details are out of date and they cannot be tracked down.

"It's quick and easy to check if you have unclaimed money. Simply visit the Revenue NSW website and type your name into the free search tool. If you do find some money, lodge a claim with Revenue NSW and collect your money," Mr Tudehope said.

"It only takes a few minutes and you could walk away with some extra Christmas money in your pocket to spend on loved ones."

The NSW Government holds unclaimed money indefinitely until it is claimed. It includes share dividends, trust accounts, refunds, commissions, deceased estates and money from a range of other sources.