Maroltov (Ostrov-Maroltov) was formerly part of the German Empire. In the German Empire, the place was called Morletzgrün.
The place is now called Maroltov (Ostrov-Maroltov) and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Marletzgrün | Austro-Hungary | Sankt Joachimsthal | before the Treaty of Saint-Germain |
| Maroltov | Czechoslovakia | Jáchymov | after the Treaty of Saint-Germain |
| Marletzgrün | Czechoslovakia | Jáchymov | after the Treaty of Saint-Germain |
| Marletzgrün | German Empire | Sankt Joachimsthal | 1938 |
| Morletzgrün | German Empire | Sankt Joachimsthal | 1938 |
| Maroltov | Czechoslovakia | Jáchymov | 1945 |
| Maroltov (Ostrov-Maroltov) | Czechoslovakia | Karlovy Vary | 1992 |
| Maroltov (Ostrov-Maroltov) | Czech Republic | Karlovy Vary | 1993 |