Pólko Kozłowskie was formerly part of the German Empire. In the German Empire, the place was called Koselmitte.
The place is now called Pólko and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Polko | German Empire | Neidenburg | 1938 |
| Koselmitte | German Empire | Neidenburg | 1939 |
| Pólko Kozłowskie | Under Polish administration | Nidzica | 1945 |
| Pólko | Poland | Olsztyn | 1992 |