523220。 According to the postcode database, the postcode of Tang Zhong is 523220. The first two represent provinces, municipalities and autonomous regions, the third represents postal areas, the fourth represents counties and cities, and represents delivery post offices. The last two represent the delivery areas in this city, that is, the location of delivery areas. The purpose of postal code is to realize the automation of mail sorting and the digitalization of postal network, and to speed up mail delivery. The postal code of Tang Zhong Town in Dongguan can satisfy the basic mail delivery.