According to the postal code database, the postal code of dachang town in Baoshan District is 200442, which is located in the southwest of Baoshan District, bordering Jing 'an District, pengpu town and Miaohang Town in Baoshan District in the east, Changzheng Town in Putuo District and Changzheng Town in Jiading County in the south, Taopu Town in Putuo District and Baoshan City Industrial Park in the west and gucun town across the river in the north.

Wannian Bridge, the historic site of Dayang Town, is located opposite to the production team 1 in North Taoyuan, Jiaocun, dachang town, Baoshan District. It is a 3-span flat beam bridge, 1 block. On the south side of Wannian Bridge, the name of the bridge in block letters "Wannian Bridge" is engraved on the mid-span bridge, and the names of the gentry and villagers who donated money during the construction of the bridge in negative letters "Reconstruction of the Winter Moon in Jiaqing Dingsi Year" are engraved on both sides, and the two ends are decorated with algae and grass patterns.