The LNU Lightning Complex Fire is made up of several fires in Napa, Lake, Sonoma and Solano counties.
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Three of the Bay Area residents who died in the fire are from Napa County.
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The other victim is from Solano County.
The victim was found while officials were assessing fire damage in the English Hills area near Pleasants Valley Road.
The man was found on a burned road, the Solano County Sheriff's Office confirmed to ABC.
RELATED: Video shows terrifying escape through flames of LNU Lightning Complex fires
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His identity has not been released.
The fire has destroyed a total of 480 structures and has damaged 125 others.
More than 30,000 structures remain threatened by wildfire.
Get the latest updates and videos on the CZU, LNU and SCU Lightning Complex Fires here.
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