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