Davos Amos ask how big cities can get. Many megacities, largely defined as over 10 million people, are rapidly growing in industrialized countries. But cities over 100 million–gigacities–could be possible this century as megacities grow and merge.

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Stephen is an urban planner with a passion for sustainable, livable, and diverse cities. He is especially interested in how policies, regulations, and programs can promote positive outcomes for communities. Stephen lives in Kenmore and primarily covers land use and transportation issues for The Urbanist.

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Gigacity isn’t the right term for one with 100 million. The Giga prefix signifies 2^30, or its decimal approximation 10^9. So you’d need a billion people to be a gigacity.