According to the postal code database, Tongzhou District, Nantong City, Jiangsu Province is 226300. The first two "22" represent Jiangsu Province, the third "6" represents Nantong City, and the last two "80" represent Tongzhou District.

Tongzhou District of Nantong City is located in the southeast of Jiangsu Province, the northeast wing of the Yangtze River Delta, bordering the Yellow Sea in the east, the Yangtze River in the west, Haimen District in the southeast, Chongchuan District in the west, Rugao City and Rudong County in the west and north.