Ernstthal was formerly part of the German Empire. In the German Empire, the place was called Ernsttal b. Oliva (Danzig-Ernst. b.O.).
The place is now called Młyniec (Gdańsk-Młyniec) and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ernstthal (b. Oliva) | German Empire | Danziger Höhe | before the Versailles Treaty |
| Ernstthal | Free City of Danzig | Danziger Höhe | after the Versailles Treaty |
| Ernstthal (Danzig-Ernstthal) | German Empire | Danzig (St.Kr.) | 1939 |
| Ernsttal b. Oliva (Danzig-Ernst. b.O.) | German Empire | Danzig (St.Kr.) | 1940 |
| NN | Poland | Gdańsk m. | 1945 |
| Młyniec (Gdańsk-Młyniec) | Poland | Gdańsk | 1992 |