Twarda Góra was formerly part of the German Empire. In the German Empire, the place was called Hardenberg, Kr. Schwetz (Weichsel).
The place is now called Twarda Góra and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hardenberg | German Empire | Schwetz | before the Versailles Treaty |
| Twarda Góra | Poland | Świecie | after the Versailles Treaty |
| Hardenberg, Kr. Schwetz (Weichsel) | German Empire | Schwetz (Weichsel) | 1939 |
| Twarda Góra | Poland | Świecie | 1945 |
| Twarda Góra | Poland | Bydgoszcz | 1992 |