Jankowice was formerly part of the German Empire. In the German Empire, the place was called Sassendorf (Ostpr.).
The place is now called Jankowice and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Jankowitz | German Empire | Osterode i. Ostpr. | 1938 |
| Sassendorf (Ostpr.) | German Empire | Osterode i. Ostpr. | 1939 |
| Jankowice | Under Polish administration | Ostróda | 1945 |
| Jankowice | Poland | Ciechanów | 1992 |