A megacity is, according to the definition of the United Nations, a city with more than 10 million inhabitants. Elsewhere, you can find thresholds between 5 and 8 million. To make matters worse, often a city is confused with a metropolitan area. For example, the area known as "Metro Manila" has about 13 million inhabitants and is often referred to as a megacity. But the city of Manila itself has less than 2 million inhabitants.
Our ranking lists the population of the actual cities with more than 5 million inhabitants. So neither combined metropolitan regions, nor higher-level government districts.
Megacities in China
The statistics above shows the official numbers. Especially in China, these may seem a little unfair, as large cities are disproportionately "constructed" here. Normally cities grow and shrink through natural urbanization. But often - especially in China - political decisions are used to combine one or more existing cities that used to coexist separately. This leads to a common municipal law structure with unified administration. In a political point of view this indeed is a single city.
For example, the Chinese government is currently planning to assemble the largest megacity Shanghai with 8 surrounding cities and to create the planned city of Jing-Jin-Ji with 130 million inhabitants. Another super city with a planned population of 40 million people is planned to be built around 2030 at the Pearl River Delta north of Hong Kong around the present cities of Shenzhen and Guangzhou. This corresponds to the population of the whole state of California.
According to current plans, there will be over 200 planned cities with a population of more than 1 million people throughout the country by 2025. 8 of them with more than 10 million.
Data as CSV file
A list of all cities with more than 1 million inhabitants can also be obtained as a CSV file in the download area