The State of Rio de Janeiro is one of the 27 states of Brazil, with Rio de Janeiro serving as its capital. Rio de Janeiro is one of the smallest states in the country, but it had a population of 16 million people in 2010, making it the most densely populated state in Brazil. Its largest cities are Rio de Janeiro, São Gonçalo, Duque de Caxias, Nova Iguaçu, Niterói, Campos dos Goytacazes, Belford Roxo, São João de Meriti, Petrópolis, Volta Redonda, Magé, Macaé, Itaboraí, Cabo Frio, Armação dos Búzios, Angra dos Reis, Nova Friburgo, Barra Mansa, Barra do Piraí, Teresópolis, Mesquita and Nilópolis.
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Location of Rio de Janeiro