, the gender distribution of the population was 48.5% male and 51.5% female. The age distribution, , in Seewis im Prättigau is; 202 children or 15.3% of the population are between 0 and 9 years old and 195 teenagers or 14.7% are between 10 and 19. Of the adult population, 128 people or 9.7% of the population are between 20 and 29 years old. 223 people or 16.9% are between 30 and 39, 188 people or 14.2% are between 40 and 49, and 129 people or 9.8% are between 50 and 59. The senior population distribution is 101 people or 7.6% of the population are between 60 and 69 years old, 91 people or 6.9% are between 70 and 79, there are 61 people or 4.6% who are between 80 and 89 there are 5 people or 0.4% who are between 90 and 99.