05400 1。 According to the query of postal code database, 05 stands for provinces (autonomous regions and municipalities directly under the Central Government), 4 stands for postal areas (a province is divided into several postal areas, that is, mail distribution and transportation networks), 0 stands for counties (cities), and 0 1 stands for post offices and their delivery areas, so the postal code of Du Xiang District, Xingtai City, Hebei Province is 05400 1. Postal code is a coding method that a country or region divides the whole country in order to realize the automation of mail sorting and the digitalization of postal network and speed up the delivery of mail.