World's Most Populous City: Tokyo

As of 2023–24 estimates, Tokyo, Japan remains the world's most populous metropolitan area:

• Tokyo Metropolis (23 wards): ~14 million.
• Greater Tokyo Area (Kantō region): ~37–38 million (including Yokohama, Saitama, Chiba).

Delhi NCR (India) and Shanghai (China) are the next largest, each ~30–33 million. Definitions vary (city proper vs. metro vs. urban agglomeration), but Tokyo consistently tops metro rankings.