Kozákov was formerly part of the German Empire. In the German Empire, the place was called Kozákov.
The place is now called -Kozákov (Radostná pod Kozákovem-) and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kozakow | Austro-Hungary | Turnau | before the Treaty of Saint-Germain |
| Kozákov | Austro-Hungary | Turnau | before the Treaty of Saint-Germain |
| Kozákov | Czechoslovakia | Turnov | after the Treaty of Saint-Germain |
| Kosakow | German Empire | Turnau | 1939 |
| Kozákov | German Empire | Turnau | 1939 |
| Kozákov | Czechoslovakia | Turnov | 1945 |
| -Kozákov (Radostná pod Kozákovem-) | Czechoslovakia | Východní Čechy | 1992 |