[5] According to the United States Census Bureau, the CDP has a total area of 8.7 square miles (23 km2), all land.

[6] The residents of Rancho San Diego are upper-middle-income, making it an above-average-income community.

Rancho San Diego has a higher income than 64.4% of the neighborhoods in America.

28.7% of its working population is employed in executive, management, and professional occupations.

Other important languages spoken here include Arabic, Aramaic, and Spanish.

Mean prices in 2011: All housing units: $620,385; Detached houses: $699,869; Townhouses or other attached units: $348,104; In 2-unit structures: $299,548; In 3-to-4-unit structures: $275,297; In 5-or-more-unit structures: $277,349; Mobile homes: $93,180 Median household income for houses/condos with a mortgage: $107,787 Median household income for apartments without a mortgage: $69,528 Median gross rent in 2011: $1,614.

There were 7,231 housing units at an average density of 815.0 per square mile (314.7/km2).

In the California State Legislature, Rancho San Diego is in the 38th Senate District, represented by Democrat Catherine Blakespear, and in the 71st Assembly District, represented by Republican Kate Sanchez.

26 (Rancho San Diego) provides landscape and open-space maintenance.

[1] Rancho San Diego is served by Cajon Valley Union School District and Grossmont Union High School District.