Rancho Santa Fe is an unincorporated census-designated place in San Diego County, California, United States. The population was 3,252 at the 2000 census. It is the highest income community in the United States with at least 2,500 households. The CDP is generally considered a bedroom community with one shopping center as well as several condominium developments and single family residential areas situated on uncommonly large lots. Rancho Santa Fe apartments for rent comparison page shows most up to date rent information on Rancho Santa Fe apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.