List shows fastest-growing cities in the world by annual population growth; Ghaziabad tops. As per the World Population Review 2026 rankings, Ghaziabad is the fastest-growing city in the world by annual population growth rate. Ghaziabad has the annual growth percentage of 5.2%. This is followed by Surat, Afghanistan's Kabul, Nigeria's Lagos, Mexico's Toluca, DR Congo's Lubumbashi, Uganda's Kampala and Angola's Luanda. Patna, Rajkot and Faridabad were also among the top cities.