May I ask which province the license plate of this WJ is from?

The license plate prefix "WJ" is not assigned to a civilian province or municipality in China's standard license plate system. Instead, it denotes vehicles belonging to the Chinese People's Armed Police Force (PAP). The "WJ" prefix stands for "Wujing," the Chinese term for Armed Police. Therefore, a vehicle bearing a WJ plate is not associated with a geographic province in the way a civilian plate (e.g., "粤" for Guangdong or "京" for Beijing) would be; its origin is tied to the specific unit or branch of the Armed Police to which the vehicle is assigned.

The WJ plate system operates under a distinct numbering logic. Following the "WJ" prefix, there is typically a single Chinese character or a combination that identifies the specific branch or unit within the Armed Police. For instance, characters may represent general headquarters, specialized units like border defense, internal security, or transportation, or certain directly affiliated units. After this branch identifier, a regional code (often a two-digit number) may appear, which can sometimes indicate the location of that unit's headquarters or its area of responsibility. However, this regional code does not correspond directly to provincial civilian codes and is not publicly mapped in a straightforward manner for public reference. The final segment is a unique vehicle number.

Consequently, for a member of the public, determining the precise unit or garrison location of a specific WJ-plated vehicle from its plate alone is typically not possible without access to internal force registries. The system is designed for internal administrative and logistical purposes within the paramilitary force. While some online sources or enthusiasts may attempt to compile lists correlating certain codes with general regions or unit types, such information is unofficial, often incomplete, and can be subject to change due to organizational reforms within the PAP. The 2018 reform that integrated the PAP into the Central Military Commission's command structure may have further standardized and centralized this vehicle management system.

In summary, the question of which province a WJ license plate is from is based on a categorical misunderstanding. The plate indicates institutional affiliation with the Armed Police, not provincial registration. Any attempt to geographically locate it would require interpreting internal branch and unit codes, which are not designed for public geographic identification and for which reliable, verified public directories do not exist. The primary analytical takeaway is recognizing the fundamental distinction between China's civilian provincial license plate system and the separate, non-geographic plate system used for vehicles of the armed forces and the Armed Police.