According to the just released 11th edition of Demographia World Urban Areas (Built-Up Urban Areas or World Agglomerations), there are now 34 urban areas in the world with more than 10 million residents, the minimum qualification for megacity status. Tokyo-Yokohama continues its 60 year leads the world's largest urban area. Before Tokyo-Yokohama, New York had been the world's largest urban area for 30 years. London's run, preceding that of New York, was much longer, at more than 100 years. Beijing, which was the first of today's megacities to reach 1,000,000 population, held the title for 75 years before London, according to census and urban historian Tertius Chandler.
