The fire broke out about 11:50 a.m. in the 6800 block of 49th Place NE, off of 67th Avenue NE, Marysville Fire Marshal Tom Maloney said.
The American Red Cross was assisting the people who lived there. No injuries were reported.
Damage was estimated at $350,000. The cause of the fire wasn't immediately clear.
Marysville firefighters also were investigating a camper trailer fire reported around the same time across town, Maloney said. The fires aren't believed to be related.
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