Sielc Stary was formerly part of the German Empire. In the German Empire, the place was called Sielz Alt.
The place is now called Sielc Stary and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sielc Stary | Russian Empire | Pultusk | 1914 |
| Sielc Stary | Poland | Pułtusk | 1919 |
| Sielz Alt | German Empire | Mackeim | 1939 |
| Sielc Stary | Poland | Maków Mazowiecki | 1945 |
| Sielc Stary | Poland | Ostrołęka | 1992 |