The Polish areas annexed by Nazi Germany reference article from the English Wikipedia on 24-Apr-2004
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Polish areas annexed by Nazi Germany

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After long discussion, Germany decided to re-annex not only all the German lands it was forced to surrendered to Poland in 1919–1922 under the Treaty of Versailles, including the "Polish Corridor", West Prussia and Upper Silesia, but also other territories. Danzig was not annexed but voted democratically to become a part of Germany again.

Two decrees by Adolf Hitler (Oct. 8 and 12, 1939) provided for the division of the occupied areas of Poland into the following administrative units:

After the German attack on the Soviet Union in June 1941, the district of Bialystok, which included the Bialystok, Bielsk Podlaski, Grajewo, Lomza, Sokolka, Volkovysk, and Grodno counties was "attached to" (not incorporated into) East Prussia.

For the policies applied on the annexed areas:

About 860,000 Poles were immediately deported from the annexed territories to the German-controlled remnant of Poland (General Government), while at the same time the Soviet Union began to expel Germans from the Baltic countries. 360,000 Baltic Germans settled down in the re-annexed lands. Poles living on the German re-annexed territories were deprived of their human rights, and faced serious persecutions. By contrast, after World War II Germans living east of the Oder-Neisse Line were transferred to Germany, but those who were former Polish citizens faced trials (see Pursuit of Nazi collaborators).