Which capital city has the most people living in it?
Tokyo is the largest capital city on the world. Tokyo is the capital city of Japan.
Tokyo, Japan with over 30,000,000 people, has the largest population of any capital city. By city proper, Istanbul is the most populated capital city in the world with 13.5 million residents. It is also the second most populous city by city proper in the world. By metropolitan area, Tokyo is the most populated capital city (and overall city) with about 30 million.
The capital city, or just capital, is the seat of government. The largest city is the city with the most people. Sometimes the largest city is also the capital, but sometimes they are two different cities. For example, Paris is both the capital and the largest city of France, but in Canada, Toronto is the largest city while Ottawa is the capital.