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.
Baixada Fluminense
Its municipalities are part of the Rio de Janeiro Metropolitan Region. The Baixada Fluminense region’s population is about three million, making it the second most populous region in the state, following only the city of Rio de Janeiro.