Sadkowiec was formerly part of the German Empire. In the German Empire, the place was called Schloßberg.
The place is now called Sadki * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schloßberg b. Nakel | German Empire | Wirsitz | before the Versailles Treaty |
| Sadkowiec | Poland | Wyrzysk | after the Versailles Treaty |
| Schloßberg | German Empire | Wirsitz | 1939 |
| Sadkowiec | Poland | Wyrzysk | 1945 |
| Sadki * | Poland | Bydgoszcz | 1992 |