Błaszki was formerly part of the German Empire. In the German Empire, the place was called Schwarzau (Wartheland).
The place is now called Błaszki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Blaszki | Russian Empire | Kališ | 1914 |
| Błaszki | Poland | Kalisz | 1921 |
| Błaszki | German Empire | Kalisch | 1939 |
| Schwarzau (Wartheland) | German Empire | Kalisch | 1939 |
| Błaszki | Poland | Kalisz | 1945 |
| Błaszki | Poland | Sieradz | 1992 |