Olsztyn was formerly part of the German Empire. In the German Empire, the place was called Allenstein.
The place is now called Olsztyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Allenstein | German Empire | Allenstein (St.Kr.) | 1939 |
| Olsztyn | Under Polish administration | Mrągowo | 1945 |
| Olsztyn | Poland | Olsztyn | 1992 |