Zieleniec was formerly part of the German Empire. In the German Empire, the place was called Hoffnungstal.
The place is now called NN and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hoffnungstal | German Empire | Hirschberg i. Rsgb. | 1939 |
| Zieleniec | Under Polish administration | Jelenia Góra | 1945 |
| NN | Czechoslovakia | Jablonec nad Nisou | 1992 |