Tarnowo was formerly part of the German Empire. In the German Empire, the place was called Schlehen.
The place is now called Tarnowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Tarnowo | German Empire | Strelno | before the Versailles Treaty |
| Tarnowo | Poland | Mogilno | after the Versailles Treaty |
| Schlehen | German Empire | Hohensalza | 1939 |
| Tarnowo | Poland | Inowrocław | 1945 |
| Tarnowo | Poland | Bydgoszcz | 1992 |