Nikolsk was formerly part of the German Empire. In the German Empire, the place was called Nikolski.
The place is now called Nikolsk and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Nikolski | Russian Empire | Sejny | 1914 |
| Nikolsk | Poland | Sejny | 1921 |
| Nikolski | German Empire | Sudauen | 1939 |
| NN | Poland | Suwałki | 1945 |
| Nikolsk | Poland | Suwałki | 1992 |