What is the postal code of Shenzhen?

Shenzhen, referred to as Pengcheng for short, is one of the four first-tier cities in China, a city under the jurisdiction of Guangdong Province, a city with separate plans, a sub-provincial city, a national regional central city, a megacity, a national economic central city and an international city, a national innovative city, an international science and technology industry innovation center, a global ocean centre city, an international comprehensive transportation hub and one of the three national financial centers in China. ?

Source: Shenzhen _ Baidu Encyclopedia