Map of Casa de Oro-Mount Helix CDP

Casa de Oro-Mount Helix is a census-designated place (CDP) 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.

The population was 18,762 at the 2010 census, down from 18,874 at the 2000 census.

Casa de Oro-Mount Helix CDP overview:
Name:	Casa de Oro-Mount Helix CDP
LSAD Code:	57
LSAD Description:	CDP (suffix)
State:	California
County:	San Diego County
Total Area:	6.85 sq mi (17.74 km²)
Land Area:	6.85 sq mi (17.74 km²)
Water Area:	0.00 sq mi (0.00 km²) 0%
Total Population:	19,576
Population Density:	2,857.39/sq mi (1,103.25/km²)
ZIP code:	91941, 91977, 92020
Area code:	619
FIPS code:	0611691
GNISfeature ID:	2407979

Online Interactive Map

Click on to view map in "full screen" mode.

Casa de Oro-Mount Helix online map. Source: Basemap layers from Google Map, Open Street Map (OSM), Arcgisonline, Wmflabs. Boundary Data from Database of Global Administrative Areas.

Casa de Oro-Mount Helix location map. Where is Casa de Oro-Mount Helix CDP?

Casa de Oro-Mount Helix location on the U.S. Map. Where is Casa de Oro-Mount Helix CDP. — Casa de Oro-Mount Helix location on the U.S. Map.

Casa de Oro-Mount Helix location on the California map. Where is Casa de Oro-Mount Helix CDP. — Location of Casa de Oro-Mount Helix in California.

History

In 1872, after a scientist discovered a European snail (Cornu aspersum, formerly Helix aspersa) living on a small mountain, Rufus King Porter, the founder of what is now unincorporated Spring Valley, California, named the peak Mt. Helix. Then in 1885, the United States Postal Service rejected the use of two words for a post office name, so Rufus submitted just the name Helix and also became the first postmaster in Spring Valley; the Helix Post Office was operated out of his home.

Around this same time, Hubert Howe Bancroft came to the area. He bought the Porters’ ranch and also acquired neighboring properties, accumulating about 500 acres (2.0 km). He began calling his property “Helix Farms.” Bancroft hired workers to help develop Helix Farms, planting orchards and building structures for his ranch. By the early 1900s, Helix Farms was home to the largest olive ranch in southern California; some of the original olive trees can still be found today. Bancroft died in 1918, and eventually his family sold the property.