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