Ramona is an unincorporated community (with some plans to incorporate) in San Diego County, California, USA. The United States Census Bureau had divided Ramona into two census-designated places, the Ramona CDP and the San Diego Country Estates CDP. The population of the CDPs, which does not include the fringe areas surrounding the CDPs, was 25,223 at the 2000 census. The Ramona Community Planning Area had a population of 33,404 at the 2000 census. The 1 January 2006 population of the Ramona Community Planning Area is estimated to be 36,405 by the San Diego Association of Governments (SANDAG).. USDA Hardiness Zones are 9b and 10a.