Koserz was formerly part of the German Empire. In the German Empire, the place was called Kusser.
The place is now called Koserz and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kusser | German Empire | Freystadt i. Niederschles. | 1939 |
| Koserz | Under Polish administration | Kożuchów | 1945 |
| Koserz | Poland | Zielona Góra | 1992 |