National Pizza Day on February 9th celebrates America’s all time favorite foods. Thin crust, Chicago style, deep dish or any pizza is an American favorite. Interesting facts: Pepperoni is the most popular pizza at 36% of all pies ordered. Over 3 billion pizzas are sold in the USA yearly & 1 billion frozen pizzas. Antica Pizzeria, first Pizzeria, opened in Naples, Italy, in 1738. Gennaro Lombardi, first Pizzeria in the United States, opened 1895 in New York. Pizza from the oven.