Zajączki I was formerly part of the German Empire. In the German Empire, the place was called Zajoncki I.
The place is now called Zajączki I and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zajączki I | Russian Empire | Čenstochov | 1914 |
| Zajączki I | Poland | Częstochowa | 1919 |
| Zajoncki I | German Empire | Blachownia/Blachstädt | 1939 |
| Zajączki I | Poland | Kłobuck | 1945 |
| Zajączki I | Poland | Częstochowa | 1992 |