Jirkov was formerly part of the German Empire. In the German Empire, the place was called Jirkov.
The place is now called Jirkov and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Jirkow | Austro-Hungary | Semil | before the Treaty of Saint-Germain |
| Jirkov | Austro-Hungary | Semil | before the Treaty of Saint-Germain |
| Jirkov | Czechoslovakia | Semily | after the Treaty of Saint-Germain |
| Jirkau | German Empire | Semil | 1939 |
| Jirkov | German Empire | Semil | 1939 |
| Jirkov | Czechoslovakia | Semily | 1945 |
| Jirkov | Czechoslovakia | Praha, Hlavní město | 1992 |