Siodłonie was formerly part of the German Empire. In the German Empire, the place was called Zedlin.
The place is now called Siodłonie and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zedlin | German Empire | Stolp | 1939 |
| Siodłonie | Under Polish administration | Słupsk | 1945 |
| Siodłonie | Poland | Słupsk | 1992 |