Comunque pizzicheria al nord è poco usato, è più frequente salumeria, o (reparto) gastronomia. La drogheria è invece uno di quei piccoli negozietti pieni di mille cose, che di solito si trovano nei paesini molto piccoli e quindi ci trovi praticamente di tutto, essendo spesso l'unico negozio a disposizione!
No, "pizzicheria" and "salumeria" are about the same thing (pizzicheria or pizzicagnolo is a regional, central or southern, name; salumeria is more national), they sell ham, cheese, sausages and delicatessen (not sure about this last word, that how they called that stuff in the US).
"Drogheria" is different, it sells mainly dry food and spices (drugs= droghe whence its name), soaps, and all sort of cleaning stuff and many many other things. They do not have fresh food, but dry fruits, cakes, candies, chocolate and liquors.
It is a very common shop in Italy, even in large cities, because it is very typical. Of course with modern supermarket, all small shops have started to disappear, unfortunately.
Thank you for the clarification. Your definition of a Drogheria is in the category of what we call a dry goods store. Both of the shops I'm referring to look more like a "pizzicheria" based on the products they are selling. Thanks to everyone who has responded.