Słonin was formerly part of the German Empire. In the German Empire, the place was called Sandwalde.
The place is now called Słonin and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Slonin | German Empire | Kosten | before the Versailles Treaty |
| Słonin | Poland | Kościan | after the Versailles Treaty |
| Sandwalde | German Empire | Kosten (Wartheland) | 1939 |
| Słonin | Poland | Kościan | 1945 |
| Słonin | Poland | Poznań | 1992 |