Leonja was formerly part of the German Empire. In the German Empire, the place was called Leonia.
The place is now called Leonia and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Leonja | Russian Empire | Turek | 1914 |
| Leonja | Poland | Konin | 1921 |
| Leonia | German Empire | Turek | 1939 |
| Leonia | Poland | Turek | 1945 |
| Leonia | Poland | Konin | 1992 |