The winner, who opted to take the cash option of $192 million, declined to take part in a news conference scheduled for Friday afternoon in Phoenix and wasn't going to be immediately identified, the lottery said.
The ticket was sold at a store in Fountain Hills, Ariz., northeast of Phoenix.
Lottery officials will not release the name or address of the winning family during the news conference but will release information about the family's decision to play, when they bought the winning ticket and how they responded to discovering they'd won, Lottery Director Jeff Hatch-Miller said.
A statement from the family will also be released, he said.
Hatch-Miller said the lottery would respond to media public records requests and release the name, but that probably would not occur before Monday because lottery officials were busy verifying that the family had the winning ticket and preparing for Friday's news conference.
"Mainly because today we're focused on the press conference, we're preparing for that," Hatch-Miller said.
A Missouri mechanic and his wife, Mark and Cindy Hill, of Dearborn, Mo., already have claimed their half of the multistate Powerball prize.
The jackpot was the second-largest in U.S. history and set off a nationwide buying frenzy. At one point, tickets were selling at nearly 130,000 a minute.
Before the Nov. 28 drawing, the jackpot had rolled over 16 consecutive times without anyone hitting the jackpot. In a Mega Millions drawing in March, three ticket buyers shared a $656 million jackpot, the largest lottery payout of all time.