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.
Niterói
Niteroi is distant from Rio de Janeiro City, to which it is linked by the Rio-Niterói bridge and two ferry-boat services. According to the 2010 Brazilian Census, the city has a population of 487,320 people, making it the fifth most populous city in the state of Rio de Janeiro and the 39th most populous in the country. At the 2010 Census, the population of Niterói grew 9.3% from 2000 to 2010, meaning Niterói had the lowest city population growth in the state of Rio de Janeiro in this period.