Mroczeń was formerly part of the German Empire. In the German Empire, the place was called Moorschütz.
The place is now called Mroczeń Nowy and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mroczen | German Empire | Kempen i. Posen | before the Versailles Treaty |
| Mroczeń | Poland | Kępno | after the Versailles Treaty |
| Mrotschen | German Empire | Kempen (Wartheland) | 1939 |
| Moorschütz | German Empire | Kempen (Wartheland) | 1939 |
| Mroczeń Stary | Poland | Kępno | 1945 |
| Mroczeń Nowy | Poland | Kępno | 1945 |
| Mroczeń | Poland | Kalisz | 1992 |
| Mroczeń Nowy | Poland | Kalisz | 1992 |