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