On January 1, Japanese media quoted a UN report as reporting that Tokyo, the capital of Japan, went from being the world's most populous city in 2000 to the third most populous city in 2025. According to the UN report, the three most populous cities in the world in 2025 are Jakarta, Indonesia, Dhaka, the capital of Bangladesh, and Tokyo in that order. By 2050, the top six most populous cities in the world are expected to be Dhaka, Jakarta, Shanghai, China, New Delhi, the capital of India, Karachi, Pakistan, and Cairo, the capital of Egypt, in that order, while Tokyo falls to 7th place. The total population of Tokyo is expected to drop to 30.7 million from 33.4 million in 2025. From 2015 to 2025, although Japan's total population decreased by about 4 million, Tokyo's population increased by more than 300,000 during this period.

On January 1, Japanese media quoted a UN report as reporting that Tokyo, the capital of Japan, went from being the world's most populous city in 2000 to the third most populous city in 2025. According to the UN report, the three most populous cities in the world in 2025 are Jakarta, Indonesia, Dhaka, the capital of Bangladesh, and Tokyo in that order. By 2050, the top six most populous cities in the world are expected to be Dhaka, Jakarta, Shanghai, China, New Delhi, the capital of India, Karachi, Pakistan, and Cairo, the capital of Egypt, in that order, while Tokyo falls to 7th place. The total population of Tokyo is expected to drop to 30.7 million from 33.4 million in 2025. From 2015 to 2025, although Japan's total population decreased by about 4 million, Tokyo's population increased by more than 300,000 during this period.