Ernsthof was formerly part of the German Empire. In the German Empire, the place was called Ernsthof.
The place is now called Zalesie and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ernsthof | German Empire | Gerdauen | 1939 |
| NN | Under Polish administration | Kętrzyn | 1945 |
| Zalesie | Poland | Olsztyn | 1992 |