According to the postcode database, the postcode of Shangcheng District of Hangzhou is 3 10002. The first two digits 3 1 represent Zhejiang province; The third digit 0 represents Hangzhou postal area; The fourth code 0 represents the post office in the upper city; The last two digits 00 indicate the specific delivery bureau (office) under the jurisdiction of Shangcheng District.
The purpose of postal code is to represent the special code of the post office that delivers the mail, because the computer can not recognize Chinese, but can recognize numbers. Coding each area can quickly realize the automatic sorting of letters by computer, which can improve the speed and accuracy of letters in the delivery process. Therefore, you must specify the postal code when sending a letter or express delivery.