According to the data in the postal code library, the postal code usually consists of Arabic numerals, which represents a special code of the post office that delivers the mail. The postcode of Dehong mangshi is 678400, which is allocated by China General Post Office to identify the postcode area of Dafang County. In order to realize the automation of mail sorting and the digitalization of postal network and speed up mail delivery.

The postal code of Dehong mangshi consists of six digits, the first digit represents the province, the code of Yunnan Province is 6, the second digit represents the city, the code of mangshi is 7, the third digit represents the district and county, and the last three digits represent the specific postal area.