National Pizza Day is February 9th. Thin crust, Chicago style or deep dish, pizza is an American favorite. Pepperoni is the most popular pizza at 36% of all pies ordered. Over 3 billion pizzas are sold in the USA each year and another 1 billion on frozen pizzas. 17% of all US Restaurants are pizzerias. The first Pizzeria, Antica Pizzeria, opened in Naples, Italy in 1738. Americans consume an average 23 pounds of pizza per person each year. Canadian bacon, sausage, mushroom and black olive pizza.