Province of Upper Silesia
During the Polish post-war census of December 1950, data about the pre-war places of residence of the inhabitants as of August 1939 was collected. In case of children born between September 1939 and December 1950, their origin was reported based on the pre-war places of residence of their mothers. Thanks to this data it is possible to reconstruct the pre-war geographical origin of the post-war population. The same territory corresponding to pre-1938 Province of Upper Silesia (which became part of Poland in 1945) was inhabited as of December 1950 by: