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.
Belo Horizonte
The Metropolitan Region of Belo Horizonte, called Greater Belo Horizonte, is the 3rd most populous of Brazil, after only Greater São Paulo (with 19,672,582 people, first in Brazil and 5th in the world) and Greater Rio de Janeiro (with 14,387,000 people). The city is the 6th most populous of the country.