Kozielec was formerly part of the German Empire. In the German Empire, the place was called Koselitz, Kr. Schwetz (Weichsel).
The place is now called Kozielec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Koselitz | German Empire | Schwetz | before the Versailles Treaty |
| Kozielec | Poland | Świecie | after the Versailles Treaty |
| Koselitz, Kr. Schwetz (Weichsel) | German Empire | Schwetz (Weichsel) | 1939 |
| Kozielec | Poland | Bydgoszcz | 1945 |
| Kozielec | Poland | Bydgoszcz | 1992 |