Leśniki was formerly part of the German Empire. In the German Empire, the place was called Klein Heinrichstal (Ostpr.).
The place is now called Leśniki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Leschnicken | German Empire | Treuburg | 1938 |
| Klein Heinrichstal (Ostpr.) | German Empire | Treuburg | 1939 |
| Leśniki | Under Polish administration | Olecko | 1945 |
| Leśniki | Poland | Suwałki | 1992 |