Demographics of Rio de Janeiro
Rio de Janeiro City is home to more than 6 million people, accounting for about 35% of the population of Rio de Janeiro State. Portuguese remains the most widely spoken language and Rio de Janeiro is the second city in the Portuguese speaking world.
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.