Butte County Sheriff Korey Honea said four people were found dead inside a vehicle in the Paradise area, while another was found nearby.
Officials said Friday the fire has destroyed 6,453 homes and another 260 commercial structures and has grown to 362 square kilometers.
In the North, another huge fire engulfed the city of Paradise, where nine people were killed, another 35 are missing.
Firefighters hope a narrow window of calm on Saturday would give them a chance to block Southern California wildfires that have marched on an inexorable path of destruction toward the sea. "All residents must evacuate immediately". Some of Hollywood's biggest stars, including Lady Gaga and Kim Kardashian, were among the evacuees. "My home is in jeopardy but. everything with a heartbeat is safe", she said. The Camp Fire had swelled to 100,000 acres as of Saturday morning.
It doubled in size in hours - turning well over 141 square kilometres into ash and fields of glowing red embers. Acting Governor Gavin Newsom called a state of emergency in Butte County. Nine people died - some in their cars as they tried to flee the racing flames.
He later tweeted a message that said early communication issues were resolved "leading to an effective response by law and fire professionals". At least six people were killed, five of them in their vehicles, as they sought to escape the fire.
Residents described fleeing their homes and getting stuck in traffic jams as the flames sparked explosions and toppled utility poles.
Firefighters said that "pretty much all of the community", which is 180 miles north-east of San Francisco, had been destroyed.
When the order came to evacuate, it was like the entire town of 27,000 residents made a decision to leave at once, they said.
Where is the Woolsey Fire spreading to? They were backed up by helicopters and water tankers. Much of the state hasn't seen rain in more than a month, according to CNN meteorologists, and the dry vegetation has only served to fuel the fires. These fires have also caused wide-spread destruction to homes and establishments, including Caitlyn Jenner's home in Malibu and the Paramount Ranch, and are now not contained.
To the south, on the outskirts of Los Angeles, two smaller fires also started Thursday and are now creating havoc.
In Southern California, wildfires were also burning.
The National Weather Service said Saturday strong winds and dry conditions were to continue through the weekend.
President Trump threatened to cut federal funding to California over "poor" management as deadly wildfires ravage parts of the state. Trump says "billions of dollars are given each year, with so many lives lost, all because of gross mismanagement of the forests".
For the latest updates about these and other California blazes, go to Cal Fire's "Incidents" page.
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