NN was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called NN and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Wongrowitz, Forsthaus | German Empire | Wongrowitz | before the Versailles Treaty |
| NN | Poland | Wągrowiec | after the Versailles Treaty |
| NN | German Empire | Eichenbrück | 1939 |
| NN | Poland | Wągrowiec | 1945 |
| NN | Poland | Piła | 1992 |