Ptuj was formerly part of the German Empire. In the German Empire, the place was called Pettau.
The place is now called Ptuj and belongs to Slovenia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Pettau | Austro-Hungary | Pettau (St.Kr.)/Ptuj m. | before the Treaty of Saint-Germain |
| Ptuj | Austro-Hungary | Pettau (St.Kr.)/Ptuj m. | before the Treaty of Saint-Germain |
| Ptuj | Yugoslavia | Ptuj m. | after the Treaty of Saint-Germain |
| Pettau | German Empire | Pettau | 1941 |
| Ptuj | Yugoslavia | Ptuj | 1945 |
| Ptuj | Yugoslavia | Socialistična rep. Slovenija | 1992 |
| Ptuj | Slovenia | Slowenien | 1991 |