The winning Powerball ticket in the weekend drawing was purchased in Stoughton, Wisconsin, lottery officials said Sunday.
It said the ticket worth $40.7 million was bought at the Food Pantry/Diamond Jubilee there.
The regular numbers drawn Saturday night were 2, 5, 16, 36 and 40 and the Powerball was 36.
The holder of the winning ticket has 180 days to claim the prize, lottery spokesman Andrew Bohage said. Once it is claimed, the winner has another 60 days to decide whether to take it in 30 annual installments or in a single lump sum of $19.3 million, he added.
It is Wisconsin's 13th Powerball jackpot since the multistate game began 15 years ago. The most recent winners were a group of 100 workers at Sargento Foods who won a $208.6 million jackpot with a ticket purchased in Fond du Lac last August.
The Powerball prize now goes to an estimated $15 million for Wednesday's drawing.