Ladung was formerly part of the German Empire. In the German Empire, the place was called Ladung.
The place is now called Loučná and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ladung | Austro-Hungary | Dux | before the Treaty of Saint-Germain |
| Ladung | Czechoslovakia | Duchcov | after the Treaty of Saint-Germain |
| Ladung | German Empire | Brüx | 1938 |
| Ladung | German Empire | Dux | 1939 |
| Loučná | Czechoslovakia | Horní Litvínov/Litvínov | 1945 |
| Loučná | Czechoslovakia | Most | 1992 |
| Loučná | Czech Republic | Most | 1993 |