For over nine thousand years, cities have played an important role in human development.
Jericho, the oldest city on record with a population of 2,000, was a center of commerce and learning. So was Uruk, Mari and other great cities through history to Tokyo, which is the largest city today.
Cities are becoming even more important as we passes through the biggest wave of urbanization in human history.
Determining the population of any city prior to the late 1700’s is no easy task. Even the most casual census was unheard of before then, and studies to nail down city populations throughout history weren’t even attempted until 1944.