Mleczno was formerly part of the German Empire. In the German Empire, the place was called Mlitsch.
The place is now called Mleczno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mlitsch | German Empire | Lüben | 1939 |
| Mleczno | Under Polish administration | Lubin | 1945 |
| Mleczno | Poland | Legnica | 1992 |