List of Sonic Stores in San Marcos, CA Outlet Note Regular Brands Sonic California San Marcos Rating 4.5 based on 91 votes Official Website https://www.sonicdrivein.com/ Products Snacks Ice Cream Drinks Chicken Hot Dogs Burgers NameAddressPhone Name/Address/Phone Sonic Drive-In outlet - San Marcos 1215 Grand Ave (760) 591-0025 Sonic outlet - San Marcos 1215 Grand Ave (760) 591-0027 People Also Viewed