(b) According to the Census 2011,states in descending order in terms of their population are Uttar Pradesh, Maharashtra, Bihar and Andhra Pradesh. The total population of the country is 1.21 billion presently. According to the State Census 2011, the most populated state in India is Uttar Pradesh with a population of 19.96 crores. The least populated state in the country is Sikkim with a population of 6,07,688.