Zassau was formerly part of the German Empire. In the German Empire, the place was called Sassau.
The place is now called Svetlogorsk * and belongs to Russian Federation.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sassau | German Empire | Samland | 1939 |
| Zassau | Under Soviet administration | Kaliningrad | 1945 |
| Svetlogorsk * | Russian Federation | Svetlogorsk g. | 1992 |