The winning Powerball ticket from Saturday's $328.5 million drawing was sold in Beaverton.
The ticket was purchased on Friday. The Oregon Lottery hasn't identified which store sold the ticket. The winner has a year to come forward to claim the prize.
Under Oregon law, with a few exceptions, winners can't remain anonymous.
The largest Powerball jackpot won in Oregon was one-point-three billion-dollars last year by a Portland man and his wife.