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Back in 1950, New York and Tokyo were the only two megacities, with populations larger than 10 million inhabitants. By 2010 the number of megacities had increased to 23, including cities like Mexico City, Los Angeles, Sao Paulo, Rio de Janeiro, Buenos Aries, Paris, Moscow, Cairo, Istanbul, Delhi, Karachi, Mumbai, Dhaka, Beijing, Shanghai, Manila, besides New York and Tokyo, the largest megacity with a population of 36.9 million. For 2025, it is estimated that there will be 29 megacities around the globe. Click here for the interactive map.