Mrocza * was formerly part of the German Empire. In the German Empire, the place was called Schönhausen, Kr. Wirsitz.
The place is now called Mrocza * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schönhausen | German Empire | Wirsitz | before the Versailles Treaty |
| Mrocza * | Poland | Wyrzysk | after the Versailles Treaty |
| Schönhausen, Kr. Wirsitz | German Empire | Wirsitz | 1939 |
| Mrocza * | Poland | Wyrzysk | 1945 |
| Mrocza * | Poland | Bydgoszcz | 1992 |