Mikołajówek was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Mikołajówek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mikolajowek | Russian Empire | Kolo | 1914 |
| Mikołajówek | Poland | Koło | 1921 |
| NN | German Empire | Warthbrücken | 1939 |
| Mikołajewek | Poland | Koło | 1945 |
| Mikołajówek | Poland | Konin | 1992 |