SONIC Drive-In Address: Highway 63 @ Hill Street, Mammoth Spring, AR 72554 Phone: (870) 625-7770 Restaurants, Foods-Carry Out, Sonic Drive In Other Businesses: Riverbend Restaurant Office at 200 S 2nd St, Mammoth Spring, AR 72554 Riverbend Restaurant Office at 200 S 2nd St, Mammoth Spring, AR 72554 Mammoth Spring Floral Express at 228 Main St, Mammoth Spring, AR 72554 La Pastorella at 355 Main St, Mammoth Spring, AR 72554