4S Ranch is an unincorporated community 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 that includes Rancho Santa Fe. Lake Hodges forms the northern border of the community while Black Mountain Ranch that includes Del Sur and Santaluz, and Rancho Peñasquitos to the south. The ZIP Code is 92127 and the community is inside area code 858.