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