Hamm unter Warsberg was formerly part of the German Empire. In the German Empire, the place was called Hamm unter Warsberg.
The place is now called Ham-sous-Varsberg and belongs to France.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ham unter Varsberg | German Empire | Bolchen | before the Versailles Treaty |
| Ham-sous-Varsberg | France | Moselle | after the Versailles Treaty |
| Hamm unter Warsberg | German Empire | Sankt Avold | 1940 |
| Ham-sous-Varsberg | France | Moselle | 1945 |
| Ham-sous-Varsberg | France | Moselle | 1993 |