By 2017, India's slum population will rise to 104 million

Census data shows how a large section of the urban population lives in slums in the four metropolitan cities -- as high as 41.3% in Greater Mumbai, 29.6% in Kolkata, 28% in Chennai and about 15% in Delhi. 
India's slum population will surge to 104 million by 2017 - or around 9% of the total projected national population of 1.28 billion that year. 

This means urban planners will face escalating challenges as these slums will mostly proliferate in sleepy towns and in semi-rural areas, a consequence of an accelerating rural to urban shift across the nation. 

According to data provided in Parliament, Maharashtra, Uttar Pradesh, Andhra Pradeshand Madhya Pradesh will host the largest chunks of India's slum population.