Ołaczewo, Folwark was formerly part of the German Empire. In the German Empire, the place was called Erlenhagen.
The place is now called Ołaczewo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Olaczewo | German Empire | Schroda | before the Versailles Treaty |
| Ołaczewo, Folwark | Poland | Środa | after the Versailles Treaty |
| Erlenhagen | German Empire | Schroda | 1939 |
| Ołaczewo | Poland | Środa | 1945 |
| Ołaczewo | Poland | Poznań | 1992 |