Petersburg was formerly part of the German Empire. In the German Empire, the place was called Petersburg.
The place is now called NN and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Petersburg | German Empire | Apenrade | before the Versailles Treaty |
| Petersborg | Denmark | Aabenraa | after the Versailles Treaty |
| NN | Denmark | Sønderjylland | 1993 |