300072。 According to the official website information of the postal code database, the postal code consists of 6 digits, and the postal code of Weijin Road Campus of Tianjin University is 300072. The first two digits 30 represent Tianjin, the third zero represents Tianjin Post Office, the fourth zero represents Tianjin Postal Area, the fifth digit 7 represents the area where Tianjin University is located, and the sixth digit 2 represents Tianjin University Post Office.