As of noon, those residents remained out of their homes due to the so-called Old Fire, which broke out near Old Highway 80 and Miller Valley Road in the Campo area.
The 900-acre fire was 30 percent contained by early evening, according to Cal Fire. The state agency estimated that the blaze would be fully surrounded by Tuesday night.
The wind-driven fire broke out around 2 p.m. Sunday and quickly charred 450 acres and destroyed one structure. It was not immediately known what the structure was. Roads and schools were closed because of the fire.
Firefighters have been tackling the flames on the ground and from the air. No injuries have been reported. The cause of the blaze remains under investigation.
The City News Service contributed to this report.