Just look at any Tokyo facts and you'll see many around the city's massive population. People who visit Japan for the first time are often surprised by the sheer mass of people in Tokyo’s rush-hour trains or in Shibuya Crossing, the busiest intersection on the planet. Sightseeing spots, too, are always crowded and even when walking down the street in a popular area, it's often hard to not bump into someone.

According to the 2019 update of Demographia World Urban Areas, Tokyo is the largest "Megacity" in the world!

Tokyo houses about 10% of Japan's population. If you include the greater Tokyo metro area of Kanagawa, Saitama, and Chiba, the total population of Tokyo reaches 38 million people! The total population of Japan is about 127 million people, so that’s a whopping 30% - and makes Tokyo the most populous urban area in the world.

Here, we compare the population of Tokyo to other Japanese prefectures and cities around the world, and will also take a look at changes and issues regarding the future.