The sheriff's office said the victims were found near the town of Paradise, which was destroyed by a blaze that forced thousands of residents to flee as it rapidly approached the outskirts of the city of Chico early Friday.
The nearby Hill Fire covered about 4,000 hectares, according to Cal Fire.
At least five deaths have been reported and as many as 2,000 structures lost in the Paradise area.
Raging fires can be seen burning through the terrain on both sides of the road during Chatfield's distressing drive, and a passenger in the vehicle can be heard saying a prayer for safety.
At its fastest, the Camp Fire in Northern California spread at more than a football field a second, or around 80 football fields per minute.
In Southern California, about two-thirds of the city of Malibu was ordered evacuated early Friday as a ferocious wildfire roared toward the beachside community that is home to about 13,000 residents, some of them Hollywood celebrities.
The vehicles with the deceased were found close to each other and near a roadway that leads out of Paradise, California, which has been largely consumed by fire since Thursday.
Her husband, the rapper Kanye West, said their family was "safe".
"The fire burned from one house, to the next house, to the next house until they were pretty much all gone", Knuthson said.
For one desperate day, Dawn Johnson anxiously waited for news of her father Richard Wayne Wilson and his wife, Suzanne, who lived in an RV park in Paradise that burned. "And just praying for a miracle, honestly", Ms Curtis said. It's like we're all walking around kind of in a trance'. "There are dozens of strike teams that we're bringing in from all parts of the state".
A school bus was among several abandoned vehicles left blackened by flames on one road. The size of the fire is about 110 square miles, he said Friday.
The freeway was closed in both directions near the Liberty Canyon Road exit due to "very active fire conditions", authorities said. He said rescuers were trying to put them in other vehicles.
Concerns about the SSFL site spread quickly around social media as people in the area saw burn maps that showed flames passing the facility and users shared a Forbes article with the headline "California's Woolsey Fire Now Threatening Malibu Went Through the Site of a Nuclear Accident First"-which states in the body of the story that the concerns about radioactive ash were unsubstantiated".
Twitter and Facebook users reported friends and loved ones living in Paradise who were unaccounted for.
Some of the patients were initially turned around during their evacuation because of gridlocked traffic and later airlifted to other hospitals, along with some staff, Kinney said. But the main facility, Adventist Health Feather River Hospital, was not, spokeswoman Jill Kinney said.
Four hospital employees were briefly trapped in the basement and rescued by California Highway Patrol officers, Kinney said.
The Camp Fire, which broke out on Thursday at the edge of the Plumas National Forest northeast of Sacramento, has since blackened more than 90,000 acres and was only 5 percent contained as of nightfall on Friday.