Rio de Janeiro
Rio has more people living in slums than any other city in Brazil, according to the 2010 Census. More than 1,500,000 people live in its 763 favelas, 22% of Rio's total population. São Paulo, the largest city in Brazil, has more favelas (1,020) in sheer numbers, but proportionally has fewer people living in favelas than Rio.
Metropolis
In Brazil, São Paulo is the principal metropolis with over 20 million inhabitants. In the larger cities, such as São Paulo and Rio de Janeiro (population 6.3 million), favelas (slums) grew up over decades as people migrated from rural areas in order to find work. The term used in Brazilian Portuguese for a metropolitan area is "Região Metropolitana". Others metropolises in Brazil with more than one million inhabitants include: Belém, Belo Horizonte, Brasília, Campinas, Curitiba, Feira de Santana, Fortaleza, Goiânia, Manaus, Porto Alegre, Recife, and Salvador.