Radomierz was formerly part of the German Empire. In the German Empire, the place was called Seiffersdorf.
The place is now called Radomierz and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Seiffersdorf | German Empire | Hirschberg i. Rsgb. | 1939 |
| Radomierz | Under Polish administration | Jelenia Góra | 1945 |
| Radomierz | Poland | Jelenia Góra | 1992 |