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. the seasonal (part-time) population can surpass 20,000. many famous people lived here including frank sinatra, bob hope, fred astaire, ginger rogers, richard nixon, gerald ford, ronald reagan, queen elizabeth ii, and tom bosley.