4 10009。 Postal code is a coding method that a country or region divides the whole country in order to realize the automation of mail sorting and the digitalization of postal network and speed up the delivery of mail. Central South University Railway Campus is located in Shaoshan South Road, Tianxin District, Changsha City, Hunan Province, with the postal code of 4 10009. The first two represent provinces (cities, autonomous regions), the third represents postal areas, the fourth represents counties (cities), and the last two represent the delivery area of the city, that is, the location of the delivery area.