Tokyo Facts: From Edo to a Megacity

Tokyo facts start with a city that changed names, governments, and scale without ever losing momentum. It is officially the Tokyo Metropolis, the capital and most populous city of Japan, and it sits at the head of Tokyo Bay in the Kantō region on Honshu.

How did Tokyo begin as Edo?

Tokyo began its rise as Edo in 1603, when it became the seat of the Tokugawa shogunate. By the mid-eighteenth century, Edo had a population surpassing one million, making it one of the great urban centers of its time.

That political importance survived the shift from shogunate rule to the modern era. In 1868, after the Meiji Restoration, Edo was renamed Tokyo, and the city entered a new chapter under a new name.

What is the Tokyo Metropolis?

Tokyo is officially the Tokyo Metropolis, and in 1943 Tokyo City merged with Tokyo Prefecture to form that structure. The result is the capital and most populous city of Japan, with a city proper population of over 14 million in 2023.

The wider urban scale is even larger. The Greater Tokyo Area had 33 million residents in 2025, which made it the third-most populous metropolitan area in the world. Those numbers help explain why Tokyo is often described through both its city core and its much larger metropolitan reach.

How has Tokyo been shaped by disaster and rebuilding?

Tokyo was greatly damaged by the 1923 Great Kantō earthquake. It also suffered Allied bombing raids during World War II. Both events left deep marks on the city’s physical landscape, yet Tokyo continued to grow into the metropolis known around the world.

The city’s long timeline runs from Edo’s early prominence to Tokyo’s modern status as a national capital. Few places combine such a layered political history with such large-scale urban growth.

Which Tokyo landmarks and transit hubs stand out?

Tokyo’s transport network includes some major landmarks in rail and metro history. The Tokyo Metro Ginza Line opened in 1927 and is the oldest underground metro line in Asia.

Tokyo Station is the central hub for the Shinkansen. Shinjuku Station is the world’s busiest train station. Those two stations anchor daily movement across a city that functions on a vast scale.

Tokyo also reaches upward in its skyline. Tokyo Skytree is the world’s tallest tower, adding another globally recognized landmark to the city’s profile.

What major world events has Tokyo hosted?

Tokyo was the first city in Asia to host the Summer Olympics and Paralympics, doing so in 1964. It later hosted the Summer Olympics again in 2021.

Those two Olympic moments bookend a long period in which Tokyo kept expanding its role as a capital, transportation hub, and global urban center. From Edo in 1603 to a metropolis of more than 14 million in the city proper, Tokyo’s story is one of reinvention at enormous scale.

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