730900。 According to the official website information of the postal code library, the area code of Pingchuan District, Baiyin City, Gansu Province is 0943 and the postal code is 730900. The first two digits of 73 represent provinces, municipalities and autonomous regions, the third digit 0 represents postal areas, the fourth digit 9 represents counties and cities, and the last two digits 00 represent specific delivery areas.