Rumian was formerly part of the German Empire. In the German Empire, the place was called Ramnitz.
The place is now called Rumian and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Rumian | German Empire | Löbau | before the Versailles Treaty |
| Rumian | Poland | Lubawa | after the Versailles Treaty |
| Ramnitz | German Empire | Neumark (Westpr.) | 1939 |
| Rumian | Poland | Działdowo | 1945 |
| Rumian | Poland | Ciechanów | 1992 |