Persons living in a square kilometre is called density of population. How many persons live in a particular area, will be known only by looking at density of population. According to Census survey of 2011, population density in India was 382 persons per sq.km. There are many Indian states where density of population is quite high such as Bihar (1106), West Bengal (1028), Kerala (860), Uttar Pradesh (829), Punjab (551) etc. But there are few states in which there is quite less density of population such as Nagaland (119), Sikkim (86), Mizoram (52), Arunachal Pradesh (17) etc. Delhi’s density of population is 11297 which is highest among all the union Territories.