Sielczno was formerly part of the German Empire. In the German Empire, the place was called Schülzen, Kr. Karthaus (Westpr.).
The place is now called Sylczno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schülzen | German Empire | Karthaus | before the Versailles Treaty |
| Sielczno | Poland | Kartuzy | after the Versailles Treaty |
| Schülzen, Kr. Karthaus (Westpr.) | German Empire | Karthaus (Westpr.) | 1939 |
| Sielczno | Poland | Bytów | 1945 |
| Sylczno | Poland | Słupsk | 1992 |