The world’s cities, defined by the United Nations as urban agglomerations, are listed in two separate tables below. The first simply lists them by size, with the 50 most populous given with their population in 2020, the largest religion in the city and the percentage of the city that is Christian. The second table sorts these cities by number of Christians. Mexico City is the fifth-largest city but has the most Christians. Five of the top ten cities with the most Christians are in Latin America, and two are in Africa.