Opilki was formerly part of the German Empire. In the German Empire, the place was called Opilki Ploskie.
The place is now called Opiłki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Opilki | Russian Empire | Prasnyš | 1914 |
| Opiłki | Poland | Przasnysz | 1919 |
| Opilki Ploskie | German Empire | Praschnitz | 1939 |
| Opiłki (Płoskie) | Poland | Przasnysz | 1945 |
| Opiłki | Poland | Ostrołęka | 1992 |