Zielnowo was formerly part of the German Empire. In the German Empire, the place was called Sellnow.
The place is now called Zielnowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sellnow | German Empire | Lauenburg i.Pom. | 1939 |
| Zielnowo | Under Polish administration | Lębork | 1945 |
| Zielnowo | Poland | Gdańsk | 1992 |