Zieleniak was formerly part of the German Empire. In the German Empire, the place was called Grünau.
The place is now called Zieleniak and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Grünau | German Empire | Allenstein | 1939 |
| Zieleniak | Under Polish administration | Olsztyn | 1945 |
| Zieleniak | Poland | Olsztyn | 1992 |