Sadykierz was formerly part of the German Empire. In the German Empire, the place was called Sadykierz.
The place is now called Sadykierz and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sadykierz | Russian Empire | Pultusk | 1914 |
| Sadykierz | Poland | Pułtusk | 1919 |
| Sadykierz | German Empire | Ostenburg | 1939 |
| Sadykierz | Poland | Pułtusk | 1945 |
| Sadykierz | Poland | Ostrołęka | 1992 |