Mostowek was formerly part of the German Empire. In the German Empire, the place was called Mostowek.
The place is now called Mostówek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mostowek | Russian Empire | Makov | 1914 |
| Mostówek | Poland | Maków | 1919 |
| Mostowek | German Empire | Mackeim | 1939 |
| Mostówek | Poland | Ostrołęka | 1945 |
| Mostówek | Poland | Ostrołęka | 1992 |