Tarnkowa was formerly part of the German Empire. In the German Empire, the place was called Trenkau.
The place is now called Tarnkowa and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Trenkau | German Empire | Leobschütz | 1939 |
| Tarnkowa | Under Polish administration | Głubczyce | 1945 |
| Tarnkowa | Poland | Opole | 1992 |