List of Denny's Stores in Mason City, IA Outlet Note Regular Brands Denny's Iowa Mason City Rating 4.8 based on 89 votes Products Fast Food Restaurant Pancake House Coffee Shop Steakhouse NameAddressPhone Name/Address/Phone Denny's outlet - Mason City 1825 4th St Sw, #C (641) 423-2442 Denny's outlet - Mason City 396 Willowbrook Dr (641) 423-8402 People Also Viewed