Grudusk-Brzozowo was formerly part of the German Empire. In the German Empire, the place was called Grudusk Brzozowo.
The place is now called Grudusk-Brzozowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Grudusk Brzozowo | Russian Empire | Cehanov | 1914 |
| Grudusk-Brzozowo | Poland | Ciechanów | 1919 |
| Grudusk Brzozowo | German Empire | Zichenau | 1939 |
| Grudusk-Brzozowo | Poland | Ciechanów | 1945 |
| Grudusk-Brzozowo | Poland | Ciechanów | 1992 |