Mercy-lès-Metz was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Mercy-lès-Metz and belongs to France.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mercy b. Metz | German Empire | Metz | before the Versailles Treaty |
| Mercy-lès-Metz | France | Moselle | after the Versailles Treaty |
| NN | German Empire | Metz | 1940 |
| Mercy-lès-Metz | France | Moselle | 1945 |
| Mercy-lès-Metz | France | Moselle | 1993 |