Mrázov was formerly part of the German Empire. In the German Empire, the place was called Prosau.
The place is now called Mrázov and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Prosau | Austro-Hungary | Tepl | before the Treaty of Saint-Germain |
| Mrázov | Austro-Hungary | Tepl | before the Treaty of Saint-Germain |
| Mrázov | Czechoslovakia | Teplá | after the Treaty of Saint-Germain |
| Prosau | Czechoslovakia | Teplá | after the Treaty of Saint-Germain |
| Prosau | German Empire | Tepl | 1938 |
| Mrázov | Czechoslovakia | Mariánské Lázně | 1945 |
| Mrázov | Czechoslovakia | Karlovy Vary | 1992 |
| Mrázov | Czech Republic | Karlovy Vary | 1993 |