List of Sonic Stores in Mount Vernon, IL Outlet Note Regular Brands Sonic Illinois 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 4801 Broadway St (618) 241-9191 People Also Viewed