Blatno was formerly part of the German Empire. In the German Empire, the place was called Pladen.
The place is now called Blatno and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Pladen | Austro-Hungary | Podersam | before the Treaty of Saint-Germain |
| Blatno | Austro-Hungary | Podersam | before the Treaty of Saint-Germain |
| Blatno | Czechoslovakia | Podbořany | after the Treaty of Saint-Germain |
| Pladen | Czechoslovakia | Podbořany | after the Treaty of Saint-Germain |
| Pladen | German Empire | Podersam | 1938 |
| Blatno | Czechoslovakia | Podbořany | 1945 |
| Blatno | Czechoslovakia | Louny | 1992 |
| Blatno | Czech Republic | Louny | 1993 |