Siedleczko was formerly part of the German Empire. In the German Empire, the place was called Brüderhausen.
The place is now called Siedleczko and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Siedletschko | German Empire | Wongrowitz | before the Versailles Treaty |
| Siedleczko | Poland | Wągrowiec | after the Versailles Treaty |
| Brüderhausen | German Empire | Eichenbrück | 1939 |
| Siedleczko | Poland | Wągrowiec | 1945 |
| Siedleczko | Poland | Piła | 1992 |