Czarnków was formerly part of the German Empire. In the German Empire, the place was called Scharnikau.
The place is now called Czarnków and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Czarnikau | German Empire | Czarnikau | before the Versailles Treaty |
| Czarnków | Poland | Czarnków | after the Versailles Treaty |
| Czarnikau | German Empire | Scharnikau (Wartheland) | 1939 |
| Scharnikau | German Empire | Scharnikau (Wartheland) | 1939 |
| Czarnków | Poland | Czarnków | 1945 |
| Czarnków | Poland | Piła | 1992 |