Sladka gora was formerly part of the German Empire. In the German Empire, the place was called Süßenberg bei Erlachstein.
The place is now called Sladka Gora and belongs to Slovenia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Süssenberg | Austro-Hungary | Cilli/Celje | before the Treaty of Saint-Germain |
| Sladka Gora | Austro-Hungary | Cilli/Celje | before the Treaty of Saint-Germain |
| Sladka gora | Yugoslavia | Šmarje | after the Treaty of Saint-Germain |
| Süßenberg bei Erlachstein | German Empire | Cilli | 1941 |
| Sladka gora | Yugoslavia | Celje | 1945 |
| Sladka Gora | Yugoslavia | Socialistična rep. Slovenija | 1992 |
| Sladka Gora | Slovenia | Slowenien | 1991 |