Gądek was formerly part of the German Empire. In the German Empire, the place was called Arnsmühl.
The place is now called Gądek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Arnsmühl | German Empire | Deutsch Krone | before the Versailles Treaty |
| Arnsmühl | German Empire | Deutsch Krone | after the Versailles Treaty |
| Arnsmühl | German Empire | Deutsch Krone | 1939 |
| Gądek | Under Polish administration | Wałcz | 1945 |
| Gądek | Poland | Piła | 1992 |