Schadau was formerly part of the German Empire. In the German Empire, the place was called Schadau.
The place is now called Szadowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schadau | German Empire | Marienwerder | before the Versailles Treaty |
| Schadau | German Empire | Marienwerder | after the Versailles Treaty |
| Schadau | German Empire | Marienwerder | 1939 |
| Schadau | German Empire | Marienwerder | 1939 |
| Szadowo | Under Polish administration | Kwidzyn | 1945 |
| Szadowo | Poland | Elbląg | 1992 |