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