Hradecko was formerly part of the German Empire. In the German Empire, the place was called Hradecko.
The place is now called Hradecko and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hradecko | Austro-Hungary | Kralowitz | before the Treaty of Saint-Germain |
| Hradecko | Czechoslovakia | Kralovice | after the Treaty of Saint-Germain |
| Hradetzko | German Empire | Kralowitz | 1939 |
| Hradecko | German Empire | Kralowitz | 1939 |
| Hradecko | Czechoslovakia | Plasy | 1945 |
| Hradecko | Czechoslovakia | Plzeň-sever | 1992 |
| Hradecko | Czech Republic | Plzeň-sever | 1993 |