According to official website information of Chicheng County People's Government, the postcode of Chicheng County, Zhangjiakou City, Hebei Province is 075500. The first two digits 07 represent provinces, municipalities and autonomous regions, the third digit 5 represents postal areas, the fourth digit 5 represents cities or counties, and the last two digits 00 represent specific delivery areas. Therefore, the postcode of Chicheng County, Zhangjiakou City, Hebei Province is 075500.