According to the postal code database, the postal code of Wenchang City, Hainan Province is 57 1300, with the first two digits 57 representing Hainan Province, the third digit 1 representing Sansha City, the fourth digit 3 representing Wenchang City, and the last two digits 00 representing specific delivery areas.

Wenchang City, Hainan Province is a county-level city located in the northeast of Hainan Province, with a total land area of 2,488 square kilometers, a sea area of 5,245 square kilometers, a coastline of 289.82 kilometers and a permanent population of 560,894.