Montwitz was formerly part of the German Empire. In the German Empire, the place was called Montwitz.
The place is now called Mącice and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Montwitz | German Empire | Ortelsburg | 1939 |
| Mącice | Under Polish administration | Szczytno | 1945 |
| Mącice | Poland | Ostrołęka | 1992 |