Sladkowice was formerly part of the German Empire. In the German Empire, the place was called Szlądkowice.
The place is now called Ślądkowice and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sladkowice | Russian Empire | Lask | 1914 |
| Ślądkowice | Poland | Łask | 1921 |
| Szlądkowice | German Empire | Lask | 1939 |
| Szlądkowice | Poland | Łask | 1945 |
| Ślądkowice | Poland | Łask | 1945 |
| Ślądkowice | Poland | Piotrków | 1992 |