CalFire spokesman Daniel Berlant said Sunday that the 2-week-old Rim Fire claimed the spot as it grew to 348 square miles Saturday.
A 1932 blaze that scorched 344 square miles in Ventura County previously stood as the state's fourth-largest wildfire.
A 427-square-mile fire in San Diego County that killed 14 people a decade ago tops the list.
Although the current wildfire still is growing, fire officials say it was 40 percent contained as of Sunday, up from 35 percent a day earlier.
A member of the BLM Silver State Hotshot crew uses a drip torch to set "back fires" on the southern flank of the Rim Fire in California. (AP photo)
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