Koźminek was formerly part of the German Empire. In the German Empire, the place was called Koschmin.
The place is now called Koźminek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Koschmin | German Empire | Meseritz | before the Versailles Treaty |
| Koschmin (Kr. Meseritz) | German Empire | Meseritz | after the Versailles Treaty |
| Koschmin | German Empire | Meseritz | 1939 |
| Koźminek | Under Polish administration | Międzyrzecz | 1945 |
| Koźminek | Poland | Zielona Góra | 1992 |