Prizes must be claimed in the jurisdiction where the winning ticket was purchased. Players can generally claim a prize up to $600 at any licensed lottery retailer in the jurisdiction where they bought the ticket. Prizes over $600 can be claimed at some lottery offices, depending on the amount, and also at lottery headquarters. Please contact your lottery with any further questions.
Reflecting common practice among American lotteries, the jackpot is advertised as a nominal value of annual installments. A cash value option (the usual choice), when chosen by a jackpot winner, pays the approximate present value of the installments. Mega Millions' previous format began on October 19, 2013; its first drawing was three days later. The current version of Mega Millions uses a 5/70 (for the white balls) plus 1/25 (for the "Mega Ball") double matrix to select its winning numbers.
The Mega Millions jackpot was most recently won in the draw on 24 July 2018 when after 22 rollovers, a single ticket purchased in San Jose, California won a jackpot worth $543 million ($320.5 million cash), the 3rd largest Mega Millions jackpot ever! Roland Reyes claimed this incredible jackpot prize on behalf of a group of 11 co-workers from the financial industry. Each of the winners contributed just $2 to the joint ticket, which was purchased with a Quick Pick random number selection. The members of the office pool said they planned to continue working despite the enormous prize money they won.
Today, all 44 individual state lotteries offer both Mega Millions and Powerball as a result of a 2009 agreement between the Mega Millions consortium and MUSL to cross-license their joint games to one another’s members, although the two organizations continue to administer Mega Millions and Powerball separately. D.C. and the U.S. Virgin Islands also offer both games. Only the Puerto Rico Lottery offers only Powerball and not Mega Millions.
Mega Millions' second-largest jackpot, $648 million, was for the December 17, 2013 drawing. Two winning tickets, one each from California and Georgia, were sold. The holder of the Georgia ticket claimed the next morning; they selected the cash option, which amounted to $173,819,742.50 before withholdings. The holder of the California ticket claimed on January 3, 2014. (The California ticket holder received an equal share, but potentially a larger cash-option amount, as California lottery winnings are exempt from state income tax)." 
The structure of the draw is one which regular lottery players will be very familiar with; players must pick 5 regular numbers from a pool with a total of 69 numbers and in addition to these regular number picks, you also choose one bonus ball (known as the Powerball) from a pool of 26. These two pools of numbers are mutually exclusive and remain completely separate throughout the drawing procedure. In order to jackpot the US Powerball, you need to match all 5 regular numbers and the Powerball. Do this and you are instant Powerball millionaire – it’s as simple as that!