Wildfires continue to ravage large stretches of California, with thousands of firefighters deployed to battle half a dozen blazes scattered across the state.

The biggest of these remains the gigantic King fire, which has now grown to cover more than 87,500 acres (or about 136 square miles). To put this in perspective, that means the fire is now larger than the cities of Atlanta, Las Vegas, Philadelphia and Portland.

Most of the land that has been burned in the King Fire is on the grounds of the Eldorado National Forest, officials say. Last week, a stretch of the forest was closed due to the fire.

But as the fire has grown, it has also begun to burn homes and other buildings. The King fire has destroyed 10 residences and another 22 structures so far, the California Department of Forestry and Fire Protection (or Cal Fire) said Sunday. And another 21,000 structures remain threatened.

Firefighters set a controlled burn to create a safe zone around homes close to the King fire. (Alvin Jordana/EPA)

Police arrested Wayne Allen Huntsman last week and charged him with arson in connection to this fire, setting his bail at $10 million. They have provided few details about Huntsman or the investigation, but said they do not think anyone else was involved in setting the fire.

About 2,800 people have been evacuated due to this blaze, which began on Sept. 13 to the east of Sacramento. The fire grew considerably last week, and it nearly tripled in size when it jumped from about 27,000 acres on Wednesday night to about 73,000 acres on Thursday night.

Cal Fire is responding to six major wildfires across the state, with about 6,500 firefighters deployed on Monday. Most of them are fighting the King blaze, which is currently about 18 percent contained.

Weather conditions on Monday should help prevent the fire from growing considerably on Monday night, as higher humidity could slow any potential spread, officials said.

California has seen a significant uptick in wildfires this year, with more of them occurring than during an average year, according to Cal Fire. Gov. Jerry Brown (D) has declared a state of emergency due to the fires. The catastrophic drought has played a key role in the growth of these wildfires, leaving bone-dry grass and brush that can easily burn and let the fires get stronger.

Cal Fire also reported that the Boles fire in Siskiyou County, which has burned nearly 500 acres since Sept. 15, has been fully contained.