Johnsdorf was formerly part of the German Empire. In the German Empire, the place was called Johnsdorf.
The place is now called Janiszów and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Johnsdorf | German Empire | Landeshut i. Schles. | 1939 |
| Janiszów | Under Polish administration | Kamienna Góra | 1945 |
| Janiszów | Poland | Jelenia Góra | 1992 |