A PR person just contacted us on behalf of the U.S. Treasury Department to point out that there are $16 billion in unredeemed bonds that are no longer earning interest. “Specifically, there are 40 million Series E savings bonds purchased between 1941 and 1978 that are over 30 years old and therefore have fully matured. They can be cashed out today for at least four times their face value.”
The U.S. Treasury Department has a site called TreasuryDirect where you can enter a person’s SSN and see if there’s any record of unredeemed bonds issued since 1974 under that name.
If you don’t want to go that route, check out this page for deatils on when each series matured.