2 15004。 According to official website information, the long-distance area code of Huaihai Street in huqiu district, Suzhou, Jiangsu Province is 05 12, and the postcode is 2 15004. The first two digits of 2 1 represent provinces, municipalities and autonomous regions, the third digit 5 represents postal areas, the fourth digit 0 represents counties and cities, and the last two digits 04 represent specific delivery areas.