According to the 2011 census Sirmaur district has a population of 530,164, roughly equal to the nation of Cape Verde. This gives it a ranking of 542nd in India (out of a total of 640). The district has a population density of 188 inhabitants per square kilometre (490 /sq mi) . Its population growth rate over the decade 2001-2011 was 15.61%. Sirmaur has a sex ratio of 915females for every 1000 males, and a literacy rate of 79.98%