It said the so-called Camp Fire is now 95 percent contained.
Another three people died in a second major blaze that struck Malibu in southern California.
The number of people unaccounted for has fallen to 993, down from a peak of more than 1,200, the statement added.
The fire has devoured an area roughly the size of Chicago, destroying nearly 10,000 homes and 2,400 other buildings.
The United States is regularly struck by wildfires in its dry late summer months. Here is a look back at some of the most deadly since the 1990s:
The US Forest Service estimates that around 3,700 homes and structures have been evacuated, or around 11,120 people.
The blaze, which has been dubbed the "Erskine Fire," has spread to more than 56 square miles (145 square kilometers) over the course of several days.
Sign up to receive our free newsletter