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.
Favela
Despite the attempts to cleanse Brazil's major cities like Rio de Janeiro and São Paulo of favelas, the poor population grew at a rapid pace as well as the modern favelas that house them in the end of last century. This is a phenomenon called "favelização" ("favela growth" or "favelisation"). In 1969, there were approximately 300 favelas in Rio de Janeiro; today there are twice as many.