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.
Soviet invasion of Poland
Of the 13.5 million civilians living in the newly annexed territories, according to the last official Polish census the population was over 38% Poles (5.1 million), 37% Ukrainians (4.7 million), 14.5% Belarusians, 8.4% Jews, 0.9% Russians and 0.6% Germans.