what county is mission viejo
Mission Viejo /ËmÉªÊÉn viËËeÉªhoÊ/ is a city in Orange County, California, United States in the Saddleback Valley. 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 its size. Its population as of 2014 was estimated at 96,346.