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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1920 | 15 november | Free town | Heinrich Friedrich Wilhelm Sahm |
| 1924 | 17 april | Poland Protectorate | |
| 1931 | 10 january | Ernst Bruno Viktor Ziehm | |
| 1933 | 20 june | Hermann Adolf Reinhold Rauschning | |
| 1934 | 23 november | Arthur Karl Greiser | |
| 1939 | 1 september | Union to Germany | Albert Forster |
| 1945 | 2 april | Union to Polonia |