According to the postal code database, the postal code of Guanchenghui District, Zhengzhou City, Henan Province is 450000. 45 in the first two places represents Henan Province, 0 in the third place represents Zhengzhou City, and 0 in the fourth place represents Guancheng Huizu District, and the last two represent specific mailing addresses. Guancheng Huizu District is located in the southeast of Zhengzhou City, bordering zhongmou county in the east, Erqi District in the west, xinzheng city in the south and Jinshui District in the north, with a total area of 107 square kilometers.