Janówka was formerly part of the German Empire. In the German Empire, the place was called Heidhofen.
The place is now called Janówka and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Janowka | German Empire | Kempen i. Posen | before the Versailles Treaty |
| Janówka | Poland | Kępno | after the Versailles Treaty |
| Heidhofen | German Empire | Kempen (Wartheland) | 1939 |
| Janówka | Poland | Kluczbork | 1945 |
| Janówka | Poland | Opole | 1992 |