Tarnowko was formerly part of the German Empire. In the German Empire, the place was called Tarnowko.
The place is now called Tarnówko and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Tarnowko | German Empire | Obornik/Obernick | before the Versailles Treaty |
| Tarnówko | Poland | Czarnków | after the Versailles Treaty |
| Tarnowko | German Empire | Scharnikau (Wartheland) | 1939 |
| Tarnówko | Poland | Czarnków | 1945 |
| Tarnówko | Poland | Piła | 1992 |