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