537127. According to the postal code website, the postal code of Zhangmu Town, Qintang District, Guigang City, Guangxi Zhuang Autonomous Region is 537127. The first two digits of 537127 represent Guangxi Zhuang Autonomous Region, the third digit represents Yulin City, the fourth digit represents Gangbei District, and the fifth and sixth digits represent Post Office Branch, Zhangmu Town, Qintang District.