According to China's customs regulations, the declaration of domestic source and destination locations must be specified down to the district or county level in economically developed areas, or to the prefecture-level city in less developed regions. The general principle followed by customs is: "The more economically developed the area, the more detailed the classification."
For instance, Zhangjiagang—a county-level city—has its source codes subdivided into 32154 (Jiangsu Zhangjiagang Free Trade Zone), 32156 (Zhangjiagang Bonded Port Area), 32157 (Zhangjiagang Bonded Logistics Park), and 32159 (Zhangjiagang Other).
In contrast, less economically developed areas like Suqian don't have such detailed classifications, with a single code of 32179 representing the entire region. This demonstrates the significant difference in classification approaches based on regional economic development.
Special economic zones are often classified separately, including export processing zones, economic development zones, and free trade zones. This article will focus specifically on the domestic source and destination codes for Tianjin, with particular attention to the Binhai New Area.
The main economic zones within Binhai New Area include 12079 (Tanggu Other), 12089 (Hangu), and 12099 (Dagang). These three areas were previously classified under Tanggu District, Hangu District, and Dagang District respectively, but have since been consolidated into a single administrative unit following the establishment of Binhai New Area.
Other regions in Tianjin maintain their own distinct codes: 12159 for Wuqing District (formerly Wuqing County) and 12179 for Baodi District (formerly Baodi County). While these areas have been officially upgraded to district status in the administrative hierarchy, their customs codes still reflect their previous county-level designations.
