The so-called Camp Fire killed at least 85 people, and 249 are on a list of those unaccounted for after burning for more than two weeks.
The wildfire, which started November 8, burned more than 153,000 acres, according to California Department of Forestry and Fire Protection officials.
On Sunday, crews continued sifting through muddy ash for human remains in and around the devastated town.
Some 475 people from Paradise and surrounding communities remain unaccounted for, according to the Butte County Sheriff's Office. It dropped an estimated 7 inches (18 centimeters) of rain over the burn area over a three-day period without causing significant mudslides, said Hannah Chandler-Cooley of the National Weather Service.
The Woolsey fire, which straddled Los Angeles and Ventura counties, began November 8 and killed three people, burned more than 96,000 acres and destroyed 1,600 structures before it was contained Thursday.
The 2 to 3 inches (5 to 8 cm) of rain that fell there during the last few days turned ash from the thousands of destroyed homes into slurry, complicating the work of finding bodies reduced to bone fragments.
"All the vegetation has burned away, and that's a risky recipe for mudslides".
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Butte County Sheriff Kory Honea has warned that remains of some victims may never be found.
According to the latest incident update from California fire authorities, the cause of the fire remains under investigation.
The Woolsey Fire, a separate fire that burned through nearly 100,000 acres in Southern California and killed at least three, was declared fully contained on Wednesday.
The California town of Paradise - which was destroyed by the wildfires - was a popular destination for retired people, with a quarter of its 27,000 residents aged 65 or older.
Ahead of the announcement that the fire has been totally tamed, authorities had already begun letting residents return to some of the worst hit areas to inspect the damage to their homes.
The Butte County Sheriff's department said that they had mistakenly added two people to an earlier death toll of 87.
More than 50,000 were forced to flee the flames, many who have lost their homes and were now living in evacuation shelters and makeshift camps.