464000。 According to the postcode of official website, the postcode of Shihe District, Xinyang City is 464000. Shihe District is a municipal district of Xinyang City, Henan Province, located in the middle of Xinyang City, the upper reaches of Huaihe River and the northern foot of Dabie Mountain. It is adjacent to Pingqiao District in the east, Tietian nonmetallic mine management zone in the south, luoshan county in the west and Shi Ping County in the north. With an area of 1783 square kilometers and a population of nearly 800,000, it is an economic, cultural, transportation, commercial and financial center. This area is named after the old Shihe River that runs through the city.