Platten was formerly part of the German Empire. In the German Empire, the place was called Platten.
The place is now called Horní Blatná and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Platten | Austro-Hungary | Neudek | before the Treaty of Saint-Germain |
| Blatno | Austro-Hungary | Neudek | before the Treaty of Saint-Germain |
| Horní Blatná | Czechoslovakia | Nejdek | after the Treaty of Saint-Germain |
| Bergstadt Platten | Czechoslovakia | Nejdek | after the Treaty of Saint-Germain |
| Platten | German Empire | Neudek | 1938 |
| Horní Blatná | Czechoslovakia | Jáchymov | 1945 |
| Horní Blatná | Czechoslovakia | Karlovy Vary | 1992 |
| Horní Blatná | Czech Republic | Karlovy Vary | 1993 |