Demographics of Poland
According to GUS, about 38,325,000 people live in Poland, however, the same report states that the number of residents living in the country all the time is approximately 37,200,000; with 1,125,000 people living abroad for 6 to 7 months or more. It means that the permanent population may be correspondingly smaller.
World War II casualties of Poland
The Polish government estimate of war dead in 1947 was based on the results of the 1931 Polish census using the criterion of language spoken to breakout the various ethnic groups. The classification of the ethnic groups in Poland during the Second Polish Republic is a disputed topic, Tadeusz Piotrowski called the 1931 Polish census "unreliable", noting that it had underestimated the number of non-Poles The official figures for nationality from the 1931 Polish census based on the mother tongue put the percentage of ethnic Poles at 68.9%, Jews 8.6% and other minority groups 22.5%., Tadeusz Piotrowski maintains that the adjusted census figures(taking religious affiliation into account) put the percentage of ethnic Poles at 64.7%, Jews 9.8% and other minority groups 25.5% of Poland's population. Based on the analysis by Tadeusz Piotrowski roughly 1.0 million Ukrainians and Belarusians and 400,000 Polish speaking Jews were misclassified as Poles in the official figures for the 1939 population. Polish demographer Piotr Eberhardt maintains that it is commonly agreed that the criterion of declared language to classify ethnic groups led to an overestimation of the number of Poles in pre-war Poland. He notes that in general, the numbers declaring a particular language do not mesh with the numbers declaring the corresponding nationality. Members of ethnic minority groups believe that the language criterion led to an overestimation of Poles.