No one won the grand prize in the last drawing on Tuesday. However, a ticket with five matching numbers sold at a Chevron gas station in Brentwood. That ticket is worth $2.3 million.
The Powerball jackpot is also growing. Saturday night's jackpot is worth $470 million.
This is the third instance in which the Mega Millions and Powerball jackpots are each worth more than $400 million at the same time.
Experts say the odds of winning tonight are about one in 302 million.