According to the postal code database, the postal code of Changzhou City, Jiangsu Province is 2 13000. The first two digits of 2 1 represent Jiangsu Province, the third digit 3 represents Changzhou City, the fourth digit 0 represents the administrative area code, and the last two digits 00 represent the specific delivery area.

Changzhou, also known as Longcheng, is a prefecture-level city under the jurisdiction of Jiangsu Province and the central city of the Yangtze River Delta. It is located in the northwest coast of East China, South Jiangsu and Taihu Lake, with Wuxi in the east, Nanjing and Zhenjiang in the west and Wuxi and Xuancheng in Anhui Province in the south, with a total area of 4,385 square kilometers.