Trojanow was formerly part of the German Empire. In the German Empire, the place was called Trojanów.
The place is now called Trojanów and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Trojanow | Russian Empire | Kališ | 1914 |
| Trojanów | Poland | Kalisz | 1921 |
| Trojanów | German Empire | Kalisch | 1939 |
| Trojanów | Poland | Kalisz | 1945 |
| Trojanów | Poland | Kalisz | 1992 |