According 2011 Census. We can't say that how much area they have covered, but you may guess by this. In 2011, 377 million people (31% of the total population) in India lived in cities, but of these, 65 million (27% of the urban population) lived in extreme shelter poverty in areas called slum. read more
As many as a million people live and work in Dharavi, a sprawling slum in Mumbai, India. Credit Adam Ferguson for The New York Times MUMBAI, India — At the edge of India’s greatest slum, Shaikh Mobin’s decrepit shanty is cleaved like a wedding cake, four layers high and sliced down the middle. read more
Slum blocks were identified in urban areas classified as towns and which had a population of 20,000 or more at that time. In Census 2011, slum blocks have been delineated in all statutory towns irrespective of population size. As a result, out of 4,041 “Statutory Towns” in Census 2011, slums were reported from 2,543 Towns (63%). read more
Urban poverty encourages the formation and demand for slums.The richer the country, the lower is the incidence of slums and, on the contrary, the higher the magnitude of slums in the country the lower is the gross national income (GNI) of that country. read more