54 1 100。 The postcode of Lingui District of Guilin City is 54 1 100, in which the first digit "5" means southwest China, the second digit "4" means Guangxi Zhuang Autonomous Region, the third digit "1" means Guilin City, the fourth digit "1" means Lingui District, and the last two digits ". The purpose of postal code is to improve the efficiency and accuracy of mail delivery and ensure that mail can be delivered to the destination quickly and accurately.