Worlds Largest Cities 2025. Megacity population and rank for world cities for the year 2025 City population projections for 2025, 2050, 2075 and 2100 as published in a paper by daniel hoornweg and kevin pope.

The perils of the world’s third nuclear age. Tokyo, japan, is the most populous city in the world, boasting a staggering population of over 37 million inhabitants.