400708。 According to the postcode database, the postcode of Caijiagang in Beibei is 400708. Beibei Caijiagang Street belongs to Beibei District of Chongqing, located at the southeast end of Beibei District, along Jialing River in the southeast, connected to Tongjiaxi Town in the south, Zhongliang Mountain in the west and Shijialiang Town in the north, with a total area of 45.75 square kilometers. It is 15 kilometers away from Beibei District People's Government, with a maximum distance of 9.35 kilometers from east to west and 7.95 kilometers from north to south.