Kossewen was formerly part of the German Empire. In the German Empire, the place was called Rechenberg (Ostpr.).
The place is now called Kosewo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kossewen | German Empire | Sensburg | 1938 |
| Rechenberg (Ostpr.) | German Empire | Sensburg | 1939 |
| Kosewo | Under Polish administration | Mrągowo | 1945 |
| Kosewo | Poland | Olsztyn | 1992 |