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