Sarnowo was formerly part of the German Empire. In the German Empire, the place was called Scharnau.
The place is now called Sarnowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Scharnau | German Empire | Neidenburg | 1939 |
| Sarnowo | Under Polish administration | Nidzica | 1945 |
| Sarnowo | Poland | Olsztyn | 1992 |