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