Grünberg was formerly part of the German Empire. In the German Empire, the place was called Grünberg, Kr. Bromberg.
The place is now called Zielonczyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Grünberg | German Empire | Bromberg | before the Versailles Treaty |
| Zielonczyn | Poland | Bydgoszcz | after the Versailles Treaty |
| Grünberg, Kr. Bromberg | German Empire | Bromberg | 1939 |
| Zielończyn | Poland | Bydgoszcz | 1945 |
| Zielonczyn | Poland | Bydgoszcz | 1992 |