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The population of Kolkata on January 1st 2011 is approximately 4,351,715. (Extrapolated from a population of 5,080,519 on August 5th 2009 and a population of 4,486,679 on June 25th 2011.)
What's the population of Kolkata (Bengali: কলকাতা ), formerly known as Calcutta, the capital of the Indian state of West Bengal and a Gamma World City in 2011?