Birkenfeld was formerly part of the German Empire. In the German Empire, the place was called Birkenfeld.
The place is now called Brzózki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Birkenfeld | German Empire | Kreuzburg O.S. | 1939 |
| Brzózki | Under Polish administration | Kluczbork | 1945 |
| Brzózki | Poland | Opole | 1992 |