Dulnik was formerly part of the German Empire. In the German Empire, the place was called Dohlmühle.
The place is now called Dulnik and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Dulnik | Russian Empire | Lipno | 1914 |
| Dulnik | Poland | Lipno | after the Versailles Treaty |
| Dohlmühle | German Empire | Leipe (Westpr.) | 1939 |
| Dulnik | Poland | Golub-Dobrzyń | 1945 |
| Dulnik | Poland | Toruń | 1992 |