Hrastnik was formerly part of the German Empire. In the German Empire, the place was called Eichtal.
The place is now called Hrastnik and belongs to Slovenia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hrastnigg | Austro-Hungary | Cilli/Celje | before the Treaty of Saint-Germain |
| Hrastnik | Austro-Hungary | Cilli/Celje | before the Treaty of Saint-Germain |
| Hrastnik | Yugoslavia | Laško | after the Treaty of Saint-Germain |
| Eichtal | German Empire | Trifail | 1941 |
| Hrastnik | Yugoslavia | Trbovlje | 1945 |
| Hrastnik | Yugoslavia | Socialistična rep. Slovenija | 1992 |
| Hrastnik | Slovenia | Slowenien | 1991 |