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