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