NN was formerly part of the German Empire. In the German Empire, the place was called NN (Busholm).
The place is now called Busholm and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Busholm) | German Empire | Sonderburg | before the Versailles Treaty |
| NN | Denmark | Sønderborg | after the Versailles Treaty |
| Busholm | Denmark | Sønderjylland | 1993 |