NN was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Bohumín and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Bohumín) | Austro-Hungary | Freistadt/Frysztat, Fryštát | before the Treaty of Saint-Germain |
| NN | Czechoslovakia | Fryštát | after the Treaty of Saint-Germain |
| NN | Poland | Frysztat/Fryštát | 1938 |
| NN | German Empire | Teschen | 1939 |
| NN | Czechoslovakia | Ostrava/Ostrava-okolí | 1945 |
| Bohumín | Czechoslovakia | Karviná | 1992 |
| Bohumín | Czech Republic | Karviná | 1993 |