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