Kölln was formerly part of the German Empire. In the German Empire, the place was called Kölln (Weichsel).
The place is now called Kolno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kölln | German Empire | Kulm | before the Versailles Treaty |
| Kolno | Poland | Chełmno | after the Versailles Treaty |
| Kölln (Weichsel) | German Empire | Kulm (Weichsel) | 1939 |
| Kolno | Poland | Chełmno | 1945 |
| Kolno | Poland | Toruń | 1992 |