At least 17 people are now confirmed dead and more than 2,000 buildings have been destroyed by the fires which broke out on Sunday.
Eleven of the deaths have been in Sonoma County.
One of the worst affected towns there is Santa Rosa, north of San Francisco, where entire districts have been destroyed.
The Sonoma County sheriff's office said 155 people were still unaccounted for, although that could be due to the chaotic pace of the evacuations.
In neighbouring Napa County, victims included 100-year-old Charles Rippey and his 98-year-old wife, Sarah, police said.
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