Sokolowek was formerly part of the German Empire. In the German Empire, the place was called Sokolowek.
The place is now called Sokołówek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sokolowek | Russian Empire | Cehanov | 1914 |
| Sokołówek | Poland | Ciechanów | 1919 |
| Sokolowek | German Empire | Zichenau | 1939 |
| Sokołowko | Poland | Ciechanów | 1945 |
| Sokołówek | Poland | Ciechanów | 1992 |