Radostowo was formerly part of the German Empire. In the German Empire, the place was called Rehbruch.
The place is now called Radostowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Radostowen | German Empire | Ortelsburg | 1936 |
| Rehbruch | German Empire | Ortelsburg | 1939 |
| Radostowo | Under Polish administration | Szczytno | 1945 |
| Radostowo | Poland | Ostrołęka | 1992 |