Zamość was formerly part of the German Empire. In the German Empire, the place was called Prosnau.
The place is now called Zamość and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zamosc | German Empire | Ostrowo | before the Versailles Treaty |
| Zamość | Poland | Ostrów Wielkopolski | after the Versailles Treaty |
| Prosnau | German Empire | Ostrowo | 1939 |
| Zamość | Poland | Ostrów Wielkopolski | 1945 |
| Zamość | Poland | Kalisz | 1992 |