According to 2011 census, the population of India is 1.21 billion.India’s population is 17.5% of the world population.
The population density in India is 382 persons per sq km. Bihar has the highest population density which is 1102 persons per sq km. Arunachal Pradesh has the least population density which is 17 persons per sq km. About 50% of India’s population lives in the five states of Uttar Pradesh, Bihar, West Bengal, Maharashtra and Andhra Pradesh. Rajasthan which is the biggest state comprises just 5% of the population of India.