Rancho Mirage is a city in Riverside County, California, United States. The population was 13,249 at the 2000 census, but the seasonal (part-time) population can exceed 20,000. In between Cathedral City and Palm Desert, it is one of the eight cities of the Coachella Valley. Rancho Mirage was incorporated in 1973 from a merger of Mirage Cove with five unincorporated areas known as the “Cove communities” ,but had 3,000 permanent residents at the time. Rancho Mirage Homes