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