A megacity is defined by a population of 10 million people and the number of megacities has grown to 31 in 2016.
Rio de Janeiro is the 20th largest city in the World 2016 with a population of 12 981 000.
The annual growth rate is 0.9% and it is 6.3% of the population in Brazil.
São Paulo is the biggest city in Brazil 2016 with a population of 21,297,000 people.
The nnual growth since 2000 in São Paulo is 1.4%. Pct. of Brazil’s population: 10.4%
The 2030 estimated population is 23,444,000
The largest city in the World is currently Tokyo with 38,140,000 residents.