The full set of US and Australian zip (postal) codes is built into PestaRoo to save you time when putting in new customers. Type in the zip, and the City, State, and County flow in instantly. And, from value lists, you can edit the list for those cases where two or more cities share the same zip code. This also allows you to add/delete a zip or city. And you can change the default value of city to match your preference.