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