Próchnowo was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Próchnowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Prochnowo | German Empire | Kolmar i. Posen | before the Versailles Treaty |
| Próchnowo | Poland | Chodzież | after the Versailles Treaty |
| NN | German Empire | Kolmar (Wartheland) | 1939 |
| Próchnowo | Poland | Chodzież | 1945 |
| Próchnowo | Poland | Piła | 1992 |