Piaszno was formerly part of the German Empire. In the German Empire, the place was called Franzwalde.
The place is now called Piaszno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Pyaschen | German Empire | Bütow | 1937 |
| Franzwalde | German Empire | Bütow | 1939 |
| Piaszno | Under Polish administration | Bytów | 1945 |
| Piaszno | Poland | Słupsk | 1992 |