Zajonczkowo was formerly part of the German Empire. In the German Empire, the place was called Zajonczkowo.
The place is now called Zajączkowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zajonczkowo | Russian Empire | Suvalki | 1914 |
| Zajączkowo | Poland | Suwałki | 1921 |
| Zajonczkowo | German Empire | Sudauen | 1939 |
| NN | Poland | Suwałki | 1945 |
| Zajączkowo | Poland | Suwałki | 1992 |