5 18 103。 In the database of postal code of Baoan District, Shenzhen, Guangdong Province, the postal code of Fuhai Street in Baoan, Shenzhen is 5 18 103. Postal code is a coding method for a country or region to divide the whole country in order to realize the automation of mail sorting and the digitalization of postal network and speed up mail delivery. Postal coding system has become one of the standards to measure a country's communication technology and postal service level.