The world’s megacities are disproportionately Asian, though Asia is the least urbanized region after Africa. Seven out of the ten most populated cities in the world are located in Asia. Of the remaining ten largest cities in the world, only Mexico City and São Paulo are in the Western Hemisphere.

Tokyo is the most populated city in the world. The Japanese capital is home to a population of 37,478,000. Nearly 30 percent of Japan’s population resides in the Tokyo metropolitan area. But given Tokyo’s geographical stretch — its metropolitan area encompasses around 27,000 square miles — it isn’t even one of the world’s most densely populated cities.

Unsurprisingly, four of the world’s largest cities by population are located in the two most populated countries: China and India. Most of the world’s fastest-growing cities are in Asia and Africa.

According to the United Nations, over four billion people — or 55.3 percent of the world’s population — live in what it defines as “urban settlements.” And that figure is expected to grow to 60 percent by 2030.

Definition of a City: City Proper, Urban Agglomeration, and Metropolitan Area

You might see significant variations in population estimates for a single city. And the reason is this: there is no single standard method for determining a city’s population.

There are three main ways to determine the geographical limits of a city and its population.

The first is strictly by its administrative boundaries — also known as the “city proper.” The second way of defining a city’s geographical limits also includes “urban agglomeration” — i.e. urban areas that are geographically contiguous to the administrative boundaries of the “city proper.” The third and most expansive definition of a city is that of the “metropolitan area,” which includes not just the city’s administrative boundaries and urban agglomeration, but also nearby suburbs linked to the “city proper” by a variety of factors, including commuting patterns. So, for example, the five boroughs constitute New York City proper, but the New York metro area also includes the nearby suburbs of Nassau and Westchester counties, which are connected to the city by the commuter rail lines and highways.

In general, the United Nations relies on “urban agglomeration” for an assessment it made in 2018.

The Most Populated Cities in the World

These are the ten most populated cities in the world, according to the United Nations Population Division.

10. Osaka, Japan — 19,281,000

A view of downtown Osaka, Japan, one of the most populated cities in the world. (Image Credit: Satoshi Hirayama/Pexels)

9. Dhaka, Bangladesh — 19,578,000

Dhaka is one of the ten most populated cities in the world.

8. Beijing, China — 19,618,000

Beijing is one of the world’s most populated cities, according to a 2018 assessment by the United Nations. (Image Credit: Paulo Marcelo/Pexels)

7. Mumbai, India — 19,980,000

Mumbai is one of the ten most populated cities in the world. (Image Credit: Ashish Limje/Pexels)

6. Cairo, Egypt — 20,076,000

Cairo is not only Egypt’s largest city, but it is also one of the world’s most populated cities.

5. Mexico City, Mexico — 21,581,000

Mexico City is the capital of Mexico and its largest city. (Image Credit: Genaro Servín/Pexels)

4. São Paulo, Brazil — 21,650,000

Sao Paulo is Brazil’s largest city and one of the most populated cities in the world.

3. Shanghai, China — 25,582,000

Shanghai is one of the five most populated cities in the world. Photo by Wolfram K on

2. Delhi, India — 28,514,000

Delhi is one of the world’s two largest megacities.

1. Tokyo, Japan — 37,478,000

A view of downtown Tokyo, which is the most populated city in the world. (Image Credit: Aleksandar Pasaric/Pexels)

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