Postomino was formerly part of the German Empire. In the German Empire, the place was called Pustamin.
The place is now called Postomino and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Pustamin | German Empire | Schlawe i.Pom. | 1939 |
| Postomino | Under Polish administration | Sławno | 1945 |
| Postomino | Poland | Słupsk | 1992 |