 According to the 2011 Polish census, there were 2,001 people residing in Osiek, of whom 50% were male and 50% were female.In the town, the population consisted of 21.2% inhabitants under the age of 18; 38.6% between the age of 18 and 44; 23.6% from 45 to 64; and 16.6% residents who were 65 years of age or older.Figure 1.