世界上最大的城市是哪？

What's the world's largest city?
世界最大城市是哪儿？

获得171k的回答@Wenzhe Chen：

As of 2015 the World Bank announced in a report on urbanisation the formation of a new world’s biggest city, in terms of population. It is a contiguous city made up of 4 major conjoined cities that have physically merged into one another - as in one can walk on an urban pavement from one to another surrounded by buildings. This is the Pearl River Metropolis in southern China that has now overtaken Tokyo, centred on Guangzhou, but taking in the megacity of Shenzhen, and the smaller cities of Dongguan and Jiangmen also. All in all it boasts of a contiguous urban population of 41 million, with a metro population of 55 million. It is over the border from Hong Kong but doesn’t count it.
2015年世界银行在一篇关于新世界最大城市形成的城市化报告中指出，就人口而言，这个联合城市由4个主要城市相连而成，它们在地理上相互交汇——因为你在城市的人行道上就能从一个城市走进另一个高楼林立的城市，这就是中国南方的珠三角城市圈，现在已经超越了东京。这里以广州为中心，同时包括大城市深圳，还有较小城市东莞和江门。总之这个城市圈自诩有4100万固定人口，城市总人口达5500万。这个城市圈已经延伸到了香港，但不包括香港。

获得992好评的回答@Anurag Jangde：

Tokyo is about twice the population of NYC. If you go back about twenty-five years, NYC was the second-largest city (after Tokyo), but now (2017) it is only ranked around 9th. This is based on metro area.
东京人口约为纽约市的2倍。如果回到约25年前，纽约市是第二大城市（仅次于东京），但现在（2017年）仅排在第九位，这是基于繁华程度划分的。

If you are speaking of population within the city proper, Shanghai comes in first and NYC drops to 23rd.
如果说的是城市人口的话，上海排第一，纽约要降到23位了。

HOWEVER, NYC was the world’s largest city in the period from about 1925 until the 1950’s. This may be what you're inquiring about.
然而纽约市从1925年到20世纪50年代一直是世界最大城市，这可能是你想知道的。

获得945 好评的回答@Tong Zou：

The answers seem to fluctuate on this question a lot and part of it is the definition of a city’s population. If a city is defined by city proper then the most populated city in the world is Shanghai.
这个问题似乎有很多答案，其中有一部分是根据城市人口定义的。如果根据城市规模划分，那世界上聚居程度最高的城市是上海。

List of cities proper by population – Wikipedia(Cities like Beijing, Tokyo, Mumbai, Karachi, Chongqing, New York etc all fall below Shanghai’s 24 million)
按人口划分城市规模的话，来自维基百科的数据是北京、东京、孟买、卡拉奇、重庆、纽约等都没有上海的2400万人口多。

If you define city by its metro area then its Tokyo with 37 million people in the metro area.
如果根据都市区划分的话，那东京的市区有3700万人口。