Mission Viejo is a commuter city in the Saddleback Valley in Orange County, California, United States. Mission Viejo is considered one of …Mission Viejo is a commuter city in the Saddleback Valley in Orange County, California, United States. Mission Viejo is considered one of the largest master-planned communities ever built under a single project in the United States and is rivaled only by Highlands Ranch, Colorado in size. Its population as of 2020 was 93,653.
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