Siecien was formerly part of the German Empire. In the German Empire, the place was called Netzen.
The place is now called Siecień and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Siecien | Russian Empire | Lipno | 1914 |
| Siecień | Poland | Płock | 1919 |
| Netzen | German Empire | Schröttersburg | 1939 |
| Siecień | Poland | Płock | 1945 |
| Siecień | Poland | Płock | 1992 |