Portola Hills is a district in the city of Lake Forest, California in Orange County, United States. It was an unincorporated community and census-designated place before it was fully annexed into Lake Forest. The population was 6,391 at the 2000 census. Portola Hills lies near Whiting Ranch Wilderness Park and Cleveland National Forest. Foothill Ranc…Portola Hills is a district in the city of Lake Forest, California in Orange County, United States. It was an unincorporated community and census-designated place before it was fully annexed into Lake Forest. The population was 6,391 at the 2000 census. Portola Hills lies near Whiting Ranch Wilderness Park and Cleveland National Forest. Foothill Ranch is to the west, Rancho Santa Margarita in the southeast, Mission Viejo in the south, and the unincorporated regions of Silverado and Santiago Canyon to the north and northeast.
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