Sandvorstadt was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Piaski and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sandvorstadt | German Empire | Birnbaum | before the Versailles Treaty |
| Piaski | Poland | Międzychód | after the Versailles Treaty |
| NN | German Empire | Birnbaum (Wartheland) | 1939 |
| Sieraków * | Poland | Międzychód | 1945 |
| Piaski | Poland | Poznań | 1992 |