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
Thaddeus Piotrowski is a Polish-American sociologist. He is a Professor of Sociology in the Social Science Division of the University of New Hampshire at Manchester. Piotrowski's assessment in 1998 of Polish war losses is that ""Jewish wartime losses in Poland are estimated to be in the 2.7-2.9 million range. (Many Polish Jews found refuge in the Soviet Union and other countries.) Ethnic Polish losses are currently estimated in the range of 2 million. (The number is probably higher if we add all those who died at the hands of the Ukrainian Nationalists.)""