NN was formerly part of the German Empire. In the German Empire, the place was called Gröben *.
The place is now called NN and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Klein Gröben | German Empire | Osterode i. Ostpr. | 1914 |
| Gröben * | German Empire | Osterode i. Ostpr. | 1939 |
| Grabinek | Under Polish administration | Ostróda | 1945 |
| NN | Poland | Olsztyn | 1992 |