Postal code is a way to realize the automation of mail sorting and the digitalization of postal network in a country or region, so as to speed up the delivery of mail and send it to the corresponding fields quickly, thus dividing all regions of the country into codes.
China postal code adopts four-level six-digit coding structure. The first two figures represent provinces, municipalities and autonomous regions; The third digit indicates the postal area; The fourth digit indicates the county and city; The last two digits represent the delivery office and the office.