List of Sonic Stores in Mount Vernon, TX Outlet Note Regular Brands Sonic Texas Mount Vernon 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 outlet - Mount Vernon 512 I-30 West (903) 537-4596 People Also Viewed