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