276800。 According to the postal code database, the postal code consists of Arabic numerals, and the postal code of Donggang District is 276800. Donggang District, belonging to Rizhao City, Shandong Province, is located in the middle of Chinese mainland coastline in the south wing of Shandong Peninsula, bordering Qingdao in the north and Lanshan District in the south, facing Korea and Japan across the sea, with a land area of 907.37 square kilometers and a coastline of 42 kilometers.