The Bonsall Community Plan area encompasses approximately 32.8 square miles, or approximately 21,042 acres. It is located in the foothills of the Penninsular Mountain Range in the unincorporated area of northern San Diego County. The southern boundary of the Bonsall Community Plan area is approximately 40 miles north of downtown San Diego. The plan area is bordered by the community of Fallbrook to the north, the City of Oceanside to the west, the community of Valley Center to the east, and the North County Metropolitan Subregion and City of Vista to the south. The community of Bonsall is characterized by a series of hills, valleys, and drainage areas. This hill and valley topography has resulted in a predominance of low density estate type residential lots and agricultural land uses. Also characterizing the Bonsall area is its golf courses and equestrian facilities. Commercial activity in Bonsall is centered in the Mission Road/Olive Hill Road and Highway 76 area.
-Bonsall Community Plan, San Diego County General Plan