Strzalkowo-Ostrów was formerly part of the German Empire. In the German Empire, the place was called Strzalkowo Ostrow.
The place is now called Ostrów and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Strzalkowo Ostrow | Russian Empire | Mlava | 1914 |
| Strzalkowo-Ostrów | Poland | Mlawa | 1919 |
| Strzalkowo Ostrow | German Empire | Mielau | 1939 |
| Strzalkowo-Ostrów | Poland | Mlawa | 1945 |
| Ostrów | Poland | Ciechanów | 1992 |