According to the postal code database, the postal code of Jinxi County, Fuzhou City, Jiangxi Province is 344800, with the first two digits 34 representing Jiangxi Province, the third digit 4 representing Fuzhou City, the fourth digit 8 representing Jinxi County, and the last two digits 00 representing the specific delivery area.

Jinxi County is known as the "Millennium Ancient Town, the Holy Land of Mind Learning, the Book Town in the South of the Yangtze River, the Xiangdu of China and the City of Civilization" and is one of the top ten cultural ancient counties in Jiangxi Province. The establishment of Jinxi County began in the fifth year of Song Chunhua (994). The four townships of Guide, Shunde and Shunzheng in Linchuan County, together with the original reform, established Jinxi County, which belongs to Fuzhou.