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