Ostaszów was formerly part of the German Empire. In the German Empire, the place was called Hierlshagen.
The place is now called Ostaszów and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hierlshagen | German Empire | Sprottau | 1939 |
| Ostaszów | Under Polish administration | Szprotawa | 1945 |
| Ostaszów | Poland | Legnica | 1992 |