Nikolaihorst was formerly part of the German Empire. In the German Empire, the place was called Nickelshorst *.
The place is now called Gałkowo * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Nikolaihorst | German Empire | Sensburg | 1938 |
| Nickelshorst * | German Empire | Sensburg | 1939 |
| NN | Under Polish administration | Mrągowo | 1945 |
| Gałkowo * | Poland | Suwałki | 1992 |