Illberg was formerly part of the German Empire. In the German Empire, the place was called Illberg (Mülhausen-Illberg).
The place is now called NN and belongs to France.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Illberg | German Empire | Mülhausen | before the Versailles Treaty |
| Illberg | France | Haut-Rhin | after the Versailles Treaty |
| Illberg (Mülhausen-Illberg) | German Empire | Mülhausen (St.Kr.) | 1940 |
| NN | France | Haut-Rhin | 1945 |
| NN | France | Haut-Rhin | 1993 |