List of Sonic Stores in Thornton, CO Outlet Note Regular Brands Sonic Colorado Thornton 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 - Thornton 3605 E 104th Ave (303) 255-4668 Sonic outlet - Thornton 8711 Washington St (303) 288-7279 People Also Viewed