Posadowo was formerly part of the German Empire. In the German Empire, the place was called Hermannstal.
The place is now called Posadowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Posadowo | German Empire | Neutomischel | before the Versailles Treaty |
| Posadowo | Poland | Nowy Tomyśl | after the Versailles Treaty |
| Hermannstal | German Empire | Grätz (Wartheland) | 1939 |
| Posadowo | Poland | Nowy Tomyśl | 1945 |
| Posadowo | Poland | Poznań | 1992 |