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