These are the records for the 5 highest unclaimed lottery prizes in the USA and Canada:

#1. Powerball (USA - Georgia): A Powerball jackpot of $77 million was unclaimed in Georgia, USA. The ticket for this prize was purchased in Tallapoosa, Georgia, for the June 29, 2011, draw but remained unclaimed after the 180-day deadline​​​​.

#2. Mega Millions (USA - New York): In New York, a Mega Millions jackpot of $68 million went unclaimed. The ticket for this draw, held on December 24, 2002, was purchased in Queens, New York. Despite someone attempting to claim the prize a year later, stating they had lost the ticket, the claim was not successful​​​​.

#3. SuperLotto Plus (USA - California): A $63 million SuperLotto Plus jackpot became the biggest unclaimed lottery prize in California's history. The winning ticket was purchased in August 2015, but no claim was made within the 180-day deadline. A lawsuit was filed by an individual claiming to have bought the winning ticket, but it was deemed invalid as the ticket was too damaged and there was no record of the claim​​​​.

#4. Lotto Max (Canada - Ontario): In Canada, the largest unclaimed prize was a CAD 70 million (approximately US$52.85 million) Lotto Max jackpot. Despite efforts to locate the 2022 ticket owner, including an awareness campaign, the prize expired as it was never validated at a lottery terminal​​.

#5. Powerball (USA - Indiana): A Powerball jackpot of $51.7 million went unclaimed in Indiana. This prize from September 2002 was the first unclaimed jackpot in US Powerball's history. Efforts were made to find the winner, including commercials and events, but the prize expired without a claim​​.