Wądzyn was formerly part of the German Empire. In the German Empire, the place was called Wansen.
The place is now called Wądzyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Wansen | German Empire | Neidenburg | before the Versailles Treaty |
| Wądzyn | Poland | Działdowo | after the Versailles Treaty |
| Wansen | German Empire | Neidenburg | 1939 |
| Wądzyn | Poland | Ostróda | 1945 |
| Wądzyn | Poland | Olsztyn | 1992 |