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