Ramona is a census-designated place in San Diego County, California. The population was 20,292 at the 2010 census. The name Ramona also refers to an unincorporated community of San Diego that includes both the Ramona CDP and the adjacent CDP of San Diego Country Estates. The population of the two CDPs, which does not include the fringe areas surrounding the CDPs, was 30,301 at the 2010 census, up from 25,223 at the 2000 census.