Browse these sites to learn what cities in the world are the most populous.
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World Cities Ranked by Population
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This page from World Atlas ranks cities of the world by population. Currently, Tokyo, Japan is number one on the list with 32,450,000 people, and Napoli, Italy is number one hundred with 3,012,000.
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Cities of the World Ranked by Population
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This resource lists the most populous cities a bit differently. The cities here are ranked (from 1 to 150) by city population, as opposed to the metro population (Population figures are provided for both city and metro populations.). On this list Karachi, Pakistan is number one with 15,500,000 in its city population.
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World Cities Ranked by Population
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This resource provides a list of world cities ranked by population (from 1 to 481) with a map showing the locations of the cities. This page also allows you to view the populations of individual countries.