4S Ranch is a locale of San Diego County, California. It is located about 25 miles north of downtown San Diego and 13 miles east of the Pacific Ocean in the North County Inland area of San Diego. To the east of 4S Ranch is the San Diego community of Rancho Bernardo.
To the west is the Santa Fe Valley, which includes Rancho Santa Fe. Lake Hodges forms the northern border of the community while Black Mountain Ranch, which includes Del Sur and Santaluz, and Rancho Peñasquitos are both situated to the south.