Sixteen people were reported missing, but nine were found safe, Shasta County Sheriff Tom Bosenko said at a Sunday press conference.
Redding Police Sgt. Todd Cogle said, "We find that there are many communication issues that make it difficult to track down residents."
"We talked to several people who left their cell phones in their homes and today no longer remember the people's phone numbers," Cogle said.
The fire, which began a week ago, is only 17%, according to the California Department of Forestry and Fire Safety, known as Cal Fire.
High temperatures, low humidity and elevated winds are all in the forecast, which will set the scene for more explosive fire, said Chris Harvey with the Cal Fire Incident Management Team Sunday.
The fire doubles in size on Saturday. Flames have destroyed at least 8,700 structures in the area, Cal Fire said.
The erratic flames are blamed for six deaths, including 70-year-old Melody Bledsoe and her great-grandchildren, 4-year-old Emily Roberts, and 5-year-old James Roberts.
Another person was found dead after a fire consumed a house, Bosenko said on Sunday.
"This fire is scary for us, it's something we have not seen in the city yet," said Roger Moore, police chief of Redding, Friday night's reporters.
The fire started on Monday when a vehicle suffered a mechanical failure. The firefighters had made progress, including them until Thursday night, when they began to spread quickly.
Firefighter, bulldozer operator also killed
At least two people died in the fight against the fire, and several others were killed
Jeremy Stoke, a fire department inspector of the Redding Fire Department, died Thursday reported the union of Redding firefighters.
Stoke, who had joined the Redding Fire Department in 2004, was assisting killed by evacuations, the union said
Even a private bulldozer, who could not be identified, died on Thursday in the fight against the fire.
Three Marin County firefighters were treated for ear, hand and face burns after experiencing a "sudden heat surge" from burning vegetation. The engineer Scott Pederson and the firefighters Tyler Barnes and Brian Cardoza have been released from a hospital, said the fire department on Friday in a press release.
A fourth firefighter was investigated at the UC Davis Burn Center, it said in the press release  Eight people were treated at the Mercy Medical Center in Redding for respiratory and burn injuries, a spokeswoman for the hospital said Friday.
"I can not believe it is gone"
The fire forced many residents to collect belongings and escape in a matter of minutes.
"We did not think the fire would come here, so we did not really unpack things like everyone else who tried at the last minute to get out when we saw fire on the ridge," said Dominic Galvin.
A resident of the French Gulch, west of Redding, said she had two hours to evacuate, but some people only had 30 minutes.
Chris Corona went home to his parents to look for their cat, Jinx. The house was gone, but Jinx was there, safely hidden in a bush on a hill, untouched by the flames that killed all the other vegetation.
Corona cried as he thought of things they had lost in the house.
I can not believe it's gone. All those memories, childhood memories, "he said," stuff that parents save, stuff that you built as a small child for your mother. I am just glad that my mother got all the valuable things she wanted. "
Plunder was reported in abandoned homes in Redding According to Police Chief Moore, some arrests were made.
The California Office of Emergency Services said on Saturday in a tweet that the state would get "help from other states to fight forest fires." These states with resources on the scene included Arizona, Idaho, Montana, Nevada, South Dakota, Wyoming, and Colorado. including Florida, Maryland, Michigan, New Jersey, New Mexico, and Oregon, have resources along the way, the tweet said.
More Fires in California
In addition to the Carr Fire burn more than a dozen other major forest fires across California, with resources expanding
The Cranston Fire near San Bernardino burned more than 13,130 acres and is 57% contain.
The fires of the ranch and river in Mendocino County have seared together more than 30,000 acres, said Cal Fire.
The Ferguson Fire in Mariposa County has burned 54,481 hectares and is 30% contained. The fire has triggered the closure of Yosemite National Park's most famous areas, which will open again to all visitors on the 3rd of August.
A Sequoia and Kings Canyon National Park firefighter, identified as Capt. Brian Hughes, died in the fight against the Ferguson fire after being beaten and killed by a tree Sunday, according to a statement from the Sequoia and Kings Canyon National Parks.
"Hughes was with the Arrowhead [Interagency] Hotshots for four years and is greatly missed by everyone in the parks," it says in the Statement. "We are mourning for his loss."
Paul Vercammen of CNN reported on Redding, Amir Vera reported and wrote from Atlanta. CNNs Nicole Chavez, Kelly McMurray and Jennifer Selva have contributed to this report.