Januszkowo was formerly part of the German Empire. In the German Empire, the place was called Osterschau.
The place is now called Januszkowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Januschkau | German Empire | Osterode i. Ostpr. | 1938 |
| Osterschau | German Empire | Osterode i. Ostpr. | 1939 |
| Januszkowo | Under Polish administration | Ostróda | 1945 |
| Januszkowo | Poland | Olsztyn | 1992 |