Crowds of people flock to the Primm Valley Lotto Store on Monday, Oct. 15. The California Lottery's Mega Millions jackpot is more than $654 million. This is fourth largest jackpot in U.S. lottery history and is closing in on third largest in the U.S. It is likely to surpass the current No. 3, also a Mega Millions' jackpot, of $656 million. If it reaches the number 3 spot in U.S. lottery jackpots, it will become the largest jackpot in the history of the Mega Millions' game.