According to the postal code database, the postal code of Poyang County is 333 100, with the first two digits 33 representing Jiangxi Province, the third digit 3 representing Shangrao City, the fourth digit 1 representing Poyang County, and the last two digits 50 representing the specific delivery area.

Poyang County, which belongs to Shangrao City, Jiangxi Province, is located in the northeast of Jiangxi Province and on the east bank of Poyang Lake. It is bordered by pengze county and dongzhi county in Anhui Province in the north, yugan county and Wannian County in the south, Changjiang District, Fuliang County and leping city in Jingdezhen City in the east, and the mountains and rivers in duchang county in the northwest.