Proseč was formerly part of the German Empire. In the German Empire, the place was called Proseč.
The place is now called Prosec and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Proseč | Austro-Hungary | Semil | before the Treaty of Saint-Germain |
| Proseč | Czechoslovakia | Semily | after the Treaty of Saint-Germain |
| Prosetsch | German Empire | Semil | 1939 |
| Proseč | German Empire | Semil | 1939 |
| Prosec | Czechoslovakia | Semily | 1945 |
| Prosec | Czechoslovakia | Východní Čechy | 1992 |