The Valle de Oro Community Planning Area encompasses approximately nineteen square miles of the unincorporated portion of the County of San Diego. The Planning Area is located to the south of the City of El Cajon and to the east of the city of La Mesa. Several neighborhoods are located within Valle de Oro. Those include: Casa de Oro, Mount Helix, Vista Grande Hills and Rancho San Diego.
-Valle de Oro Community Plan, San Diego County General Plan