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