Bagna was formerly part of the German Empire. In the German Empire, the place was called Bagna Kolonie.
The place is now called Bagna and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Bagna | German Empire | Obornik/Obernick | before the Versailles Treaty |
| Bagna | Poland | Oborniki | after the Versailles Treaty |
| Bagna Kolonie | German Empire | Obernick | 1939 |
| Bagna | Poland | Oborniki | 1945 |
| Bagna | Poland | Piła | 1992 |