Bilsken was formerly part of the German Empire. In the German Empire, the place was called Billsee.
The place is now called Bielskie and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Bilsken | German Empire | Lötzen | 1938 |
| Billsee | German Empire | Lötzen | 1939 |
| Bielskie | Under Polish administration | Giżycko | 1945 |
| Bielskie | Poland | Suwałki | 1992 |