NN (Mondorf) was formerly part of the German Empire. In the German Empire, the place was called Mondorf.
The place is now called Mondorf-les-Bains and belongs to Luxembourg.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Mondorf) | Luxembourg | Grevenmacher | 1939 |
| Mondorf | German Empire | Grevenmacher | 1940 |
| Mondorf-les-Bains | Luxembourg | Grevenmacher | 1945 |
| Mondorf-les-Bains | Luxembourg | Grevenmacher | 1993 |