Brisk sales have pushed Saturday's Powerball jackpot up another $20 million, to $380 million.
The bump in the jackpot was posted Friday at powerball.com.
Saturday's drawing, worth a lump-sum payment of $256.8 million, matches the 10th-largest jackpot in the history of multistate big-prize games.
A Mega Millions jackpot in January 2011 also was $380 million.
Jackpot bumps between drawings are common when prizes reach $300 million or larger, lottery officials say, because of higher-than-anticipated ticket sales.
After no one matched all six numbers -- 24, 36, 51, 52, 56 and the Powerball of 22 -- in Wednesday's drawing, the jackpot increased to $360 million.
Saturday's Powerball drawing will be the 20th since the last jackpot of $90 million was won, on Nov. 29, by a ticket holder in Washington state.
Mega Millions owns the two largest jackpots -- $656 million won in March 2012 and $648 million won in December 2013.
The largest Powerball jackpot was $590.5 million in May 2013.
The Powerball game is played in 44 states; Washington, D.C.; Puerto Rico; and the U.S. Virgin Islands.