Demographics
The population of the county in 2009 was estimated at 305,954 inhabitants by the Brazilian Institute of Geography and Statistics (IBGE). It is the largest city in the state and one of Brazil's most populous. The population density of 33.17 inhabitants per square kilometer. According to the 2000 census, 51% of the population are male and 48.2% female; 92.73% of the population lives in urban areas and 7.22% live in rural areas. According to the Atlas of Human Development in Brazil, the population of Rio Branco is 0.16% of the national population. According to the Superior Electoral Court, Rio Branco had 201,966 voters in 2008 .
The Municipal Human Development Index of Rio Branco is considered average by the United Nations Development Programme, with a value of 0.754. The education index is 0.860, while Brazil's is 0.849. The rate of longevity is 0.697 (the Brazilian rate is 0.638) and income is 0.704 (Brazil's is 0.723). The Gini coefficient, which measures inequality, is 0.52, where 1.00 is the worst result and 0.00 is the best. The incidence of poverty, as measured by the IBGE, is 37.21 per cent, and the incidence of subjective poverty is 39.39 per cent.
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