Siarcza Laka was formerly part of the German Empire. In the German Empire, the place was called Siarcza Lonka.
The place is now called Siarcza Łąka and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Siarcza Laka | Russian Empire | Ostrolenka | 1914 |
| Siarcza Łąka | Poland | Ostrołęka | 1919 |
| Siarcza Lonka | German Empire | Scharfenwiese | 1939 |
| Siarcza Łąka | Poland | Ostrołęka | 1945 |
| Siarcza Łąka | Poland | Ostrołęka | 1992 |