Mierzynek was formerly part of the German Empire. In the German Empire, the place was called Merzen.
The place is now called Mierzynek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mierzynek | Russian Empire | Lipno | 1914 |
| Mierzynek | Poland | Lipno | after the Versailles Treaty |
| Merzen | German Empire | Leipe (Westpr.) | 1939 |
| Mierzynek | Poland | Toruń | 1945 |
| Mierzynek | Poland | Toruń | 1992 |