Casa de Oro-Mount Helix is a census-designated place in the East County region of San Diego County, California. The CDP encompasses several unincorporated neighborhoods near the cities of El Cajon and La Mesa and the CDP of Spring Valley. Locations in the northern (Mount Helix) part of the CDP use La Mesa addresses, while locations in the southern (…Casa de Oro-Mount Helix is a census-designated place in the East County region of San Diego County, California. The CDP encompasses several unincorporated neighborhoods near the cities of El Cajon and La Mesa and the CDP of Spring Valley. Locations in the northern (Mount Helix) part of the CDP use La Mesa addresses, while locations in the southern (Casa de Oro) part use Spring Valley addresses. Informally, Casa de Oro is often considered to be a part of Spring Valley.
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