Niewiadowo was formerly part of the German Empire. In the German Empire, the place was called Harmsdorf.
The place is now called Niewiadowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Harmsdorf | German Empire | Cammin i.Pom. | 1939 |
| Niewiadowo | Under Polish administration | Kamień Pomorski | 1945 |
| Niewiadowo | Poland | Szczecin | 1992 |