what county is rancho mirage in
Rancho Mirage, California. Rancho Mirage is a resort city in Riverside County, California, United States. The population was 17,218 at the 2010 census, up from 13,249 at the 2000 census, but the seasonal (part-time) population can exceed 20,000. Located between Cathedral City and Palm Desert, it is one of the nine cities of the Coachella Valley (Palm Springs area).