Kościan was formerly part of the German Empire. In the German Empire, the place was called Kosten (Wartheland).
The place is now called Kościan and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kosten (Bz. Posen) | German Empire | Kosten | before the Versailles Treaty |
| Kościan | Poland | Kościan | after the Versailles Treaty |
| Kosten | German Empire | Kosten (Wartheland) | 1939 |
| Kosten (Wartheland) | German Empire | Kosten (Wartheland) | 1939 |
| Kościan | Poland | Kościan | 1945 |
| Kościan | Poland | Leszno | 1992 |