Plasy was formerly part of the German Empire. In the German Empire, the place was called Plasy.
The place is now called Plasy and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Plass | Austro-Hungary | Kralowitz | before the Treaty of Saint-Germain |
| Plasy | Austro-Hungary | Kralowitz | before the Treaty of Saint-Germain |
| Plasy | Czechoslovakia | Kralovice | after the Treaty of Saint-Germain |
| Plaß | German Empire | Kralowitz | 1939 |
| Plasy | German Empire | Kralowitz | 1939 |
| Plasy | Czechoslovakia | Plasy | 1945 |
| Plasy | Czechoslovakia | Plzeň-sever | 1992 |
| Plasy | Czech Republic | Plzeň-sever | 1993 |