Szlagnowo was formerly part of the German Empire. In the German Empire, the place was called Schlablau.
The place is now called Szlagnowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schlablau | German Empire | Marienburg i. Westpr. | before the Versailles Treaty |
| Schlablau | German Empire | Marienburg | after the Versailles Treaty |
| Schlablau | German Empire | Marienburg | 1939 |
| Schlablau | German Empire | Marienburg (Westpr.) | 1939 |
| Szlagnowo | Under Polish administration | Malbork | 1945 |
| Szlagnowo | Poland | Elbląg | 1992 |