Żerków was formerly part of the German Empire. In the German Empire, the place was called Bergstadt (Kr. Jarotschin).
The place is now called Żerków and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zerkow (Bz. Posen) | German Empire | Jarotschin | before the Versailles Treaty |
| Żerków | Poland | Jarocin | after the Versailles Treaty |
| Zerkow | German Empire | Jarotschin | 1939 |
| Bergstadt (Kr. Jarotschin) | German Empire | Jarotschin | 1939 |
| Żerków | Poland | Jarocin | 1945 |
| Żerków | Poland | Kalisz | 1992 |