Kolacin was formerly part of the German Empire. In the German Empire, the place was called Kołacin.
The place is now called Kołacin and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kolacin | Russian Empire | Breziny | 1914 |
| Kołacin | Poland | Brzeziny | 1921 |
| Kołacin | German Empire | Litzmannstadt/Lodsch | 1939 |
| Kołacin | Poland | Brzeziny | 1945 |
| Kołacin | Poland | Skierniewice | 1992 |