Mladecko was formerly part of the German Empire. In the German Empire, the place was called Mladetzko.
The place is now called Mladecko and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mladetzko | Austro-Hungary | Troppau | before the Treaty of Saint-Germain |
| Mladecko | Austro-Hungary | Troppau | before the Treaty of Saint-Germain |
| Mladosice | Austro-Hungary | Troppau | before the Treaty of Saint-Germain |
| Mladecko | Czechoslovakia | Opava | after the Treaty of Saint-Germain |
| Mladetzko | Czechoslovakia | Opava | after the Treaty of Saint-Germain |
| Mladetzko | German Empire | Troppau | 1938 |
| Mladecko | Czechoslovakia | Opava | 1945 |
| Mladecko | Czechoslovakia | Opava | 1992 |
| Mladecko | Czech Republic | Opava | 1993 |