19 Cities in History Leading the World in Population Since 7000 BCE
From 7000 BCE to today, at least 19 cities have led the world in population.
Cities have, of course, grown vastly bigger over time. Nine thousand years ago, Çatalhöyük led the world with 1,000 people. Today, Tokyo has 38 million.
This trend is a mark of increasing social complexity, and it could be just getting started.