Lontzen was formerly part of the German Empire. In the German Empire, the place was called Lontzen.
The place is now called Lontzen and belongs to Belgium.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Lontzen | German Empire | Eupen | before the Versailles Treaty |
| Lontzen | Belgium | Liège | after the Versailles Treaty |
| Lontzen | German Empire | Eupen (einschl. Moresnet) | 1940 |
| Lontzen | Belgium | Liège | 1945 |
| Lontzen | Belgium | Lüttich/Liège | 1993 |