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Room of Japan · Japan at a glance

Tokyo, the capital

In short

Tokyo is the capital of Japan. About 14.27 million people live there (October 1, 2025), the most of Japan’s 47 prefectures.
Capital of JapanOld name: Edo
東京都Tokyo Metropolis
People
about 14.27 million
Area
2,199.94 km²
People per km²
6,488 (the most in Japan)
Made up of
23 special wards, 26 cities, 5 towns, 8 villages

From the Tokyo Metropolitan Government. People as of October 1, 2025 (estimate). Area as of July 1, 2025.

From Edo to Tokyo

Tokyo was first called Edo. The city started to grow after Tokugawa Ieyasu set up his government, the Tokugawa Shogunate, there in 1603.

By the middle of the 1700s, Edo had more than a million people. In 1721 the first count of the people found about 1.3 million.

In 1868 the Meiji period began. Edo was renamed Tokyo, and the Emperor moved there from Kyoto.

One metropolis

In 1943, Tokyo Prefecture and Tokyo City were joined to make the Metropolis of Tokyo. The 23 special wards began in 1947.

Today Tokyo has three parts. The 23 special wards have about 9.95 million people. The Tama area (26 cities, 3 towns and 1 village) has about 4.30 million. The islands in the Pacific Ocean, the Izu Islands and the Ogasawara Islands, have about 22,000.

Small land, many people

Tokyo covers only 0.6% of Japan’s land, but about 11.6% of Japan’s people live there.

With 6,488 people per square kilometer, Tokyo is the most crowded prefecture in Japan.

Think about it

There is no single right answer. Talking it over with someone at home is a good way to learn.

Did you know? — Japan’s first railway opened in 1872, between Shimbashi in Tokyo and Yokohama.
Next steps
About this page
All facts: Tokyo Metropolitan Government, “Tokyo’s History, Geography, and Population”
Written by CCN CO., LTD.
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